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  <xsd:element id="ocs_NumberOfManagedAndOperatedSegments" name="NumberOfManagedAndOperatedSegments" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_NumberOfOtherEquityInstrumentsGrantedAndExercisedInShareBasedPaymentArrangement" name="NumberOfOtherEquityInstrumentsGrantedAndExercisedInShareBasedPaymentArrangement" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_NumberOfOtherEquityInstrumentsNotSubjectToRepurchaseInShareBasedPaymentArrangement" name="NumberOfOtherEquityInstrumentsNotSubjectToRepurchaseInShareBasedPaymentArrangement" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="ocs_NumberOfReportingSegments" name="NumberOfReportingSegments" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_NumberOfSharesAcquired" name="NumberOfSharesAcquired" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="ocs_NumberOfSharesInCommercialRegister" name="NumberOfSharesInCommercialRegister" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="ocs_NumberOfWhollyOwnedSubsidiaries" name="NumberOfWhollyOwnedSubsidiaries" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_NumberOfWorkPackages" name="NumberOfWorkPackages" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_OfficeLeaseAdditionOrRemeasurementLiabilities" name="OfficeLeaseAdditionOrRemeasurementLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_OtherPIPEInvestorsConsideringDeemedValuePerShare" name="OtherPIPEInvestorsConsideringDeemedValuePerShare" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="ocs_OutsourcedExpenses" name="OutsourcedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_OutstandingSharesExpirationPeriod" name="OutstandingSharesExpirationPeriod" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_PaymentOfFirstContractualNonRefundableCostContribution" name="PaymentOfFirstContractualNonRefundableCostContribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ocs_PaymentsReceived" name="PaymentsReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ocs_PayrollExpenseRelatedToRestrictedStockNet" name="PayrollExpenseRelatedToRestrictedStockNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_PayrollRelatedAccrualCurrent" name="PayrollRelatedAccrualCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ocs_PercentageOfPossibleTax" name="PercentageOfPossibleTax" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_PercentageOfProjectManagementFee" name="PercentageOfProjectManagementFee" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_PeriodOfReasonablyPossibleDecreaseInActuarialAssumption" name="PeriodOfReasonablyPossibleDecreaseInActuarialAssumption" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_PeriodOfReasonablyPossibleIncreaseInActuarialAssumption" name="PeriodOfReasonablyPossibleIncreaseInActuarialAssumption" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_PerSharePurchasePrice" name="PerSharePurchasePrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="ocs_PotentialDilutiveEffectNotIncludedInCalculationOfDilutedPerShare" name="PotentialDilutiveEffectNotIncludedInCalculationOfDilutedPerShare" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_PreferredDividendInterestPayment" name="PreferredDividendInterestPayment" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_PrepaidAndOtherCMCResearchAndClinicalExpenses" name="PrepaidAndOtherCMCResearchAndClinicalExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_ProjectManagementFee" name="ProjectManagementFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_RedemptionOptionAmountEquivalentToInvestorsInvestmentAccruedDividendAndCompoundInterestAmount" name="RedemptionOptionAmountEquivalentToInvestorsInvestmentAccruedDividendAndCompoundInterestAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_RedemptionOptionAmountEquivalentToInvestorsInvestmentAccruedDividendAndCompoundInterestRate" name="RedemptionOptionAmountEquivalentToInvestorsInvestmentAccruedDividendAndCompoundInterestRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_RedemptionOptionUponAmountEquivalentToInvestorsInvestmentInterest" name="RedemptionOptionUponAmountEquivalentToInvestorsInvestmentInterest" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_ReimbursedCosts" name="ReimbursedCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_ReimbursementOfDevelopmentRelatedCost" name="ReimbursementOfDevelopmentRelatedCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_RestrictedSharesAwards" name="RestrictedSharesAwards" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ocs_ShareBasedPaymentAwardVestingPeriod" name="ShareBasedPaymentAwardVestingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_ShareholdersExercisedTheirRightToRedeemAmount" name="ShareholdersExercisedTheirRightToRedeemAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ocs_SharePriceOptionPricingModel" name="SharePriceOptionPricingModel" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_SharesIssuedDuringPeriod" name="SharesIssuedDuringPeriod" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ocs_SharesIssuedDuringPeriodShares" name="SharesIssuedDuringPeriodShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_SharesIssuedDuringPeriodStockOptionExercised" name="SharesIssuedDuringPeriodStockOptionExercised" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_TaxesAtWeightedAverageIncomeTaxes" name="TaxesAtWeightedAverageIncomeTaxes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ocs_TransactionCosts" name="TransactionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_TransactionCostsForIssuanceOfPreferredSharesCapitalIncrease" name="TransactionCostsForIssuanceOfPreferredSharesCapitalIncrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_TransactionCostsForIssuanceOfPreferredSharesCapitalIncreaseDecrease" name="TransactionCostsForIssuanceOfPreferredSharesCapitalIncreaseDecrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ocs_TransactionCostsRelatedToBusinessCombinationAgreementRecordedInAccruedExpensesAndOtherPayablesTradePayables" name="TransactionCostsRelatedToBusinessCombinationAgreementRecordedInAccruedExpensesAndOtherPayablesTradePayables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_TransactionCostsShares" name="TransactionCostsShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_TransactionsCostRelatedToBusinessCombinationAgreement" name="TransactionsCostRelatedToBusinessCombinationAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="ocs_UpfrontPayment" name="UpfrontPayment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="ocs_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedAndExercisedInShareBasedPaymentArrangement" name="WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedAndExercisedInShareBasedPaymentArrangement" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_WeightedAverageExercisePriceOfOtherEquityInstrumentsNotSubjectToRepurchaseInShareBasedPaymentArrangement" name="WeightedAverageExercisePriceOfOtherEquityInstrumentsNotSubjectToRepurchaseInShareBasedPaymentArrangement" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfBasisOfPreparationAndChangesToGroupAccountingPoliciesLineItems" name="DisclosureOfBasisOfPreparationAndChangesToGroupAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_DisclosureOfCashAndCashequivalentsByCurrencyLineitems" name="DisclosureOfCashAndCashequivalentsByCurrencyLineitems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_DisclosureOfShareCapitalSharePremiumAndTreasurySharesLineItems" name="DisclosureOfShareCapitalSharePremiumAndTreasurySharesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_DisclosureOtherCurrentAssetsAndAccruedIncomeAdditionalInformationDetailsLineItems" name="DisclosureOtherCurrentAssetsAndAccruedIncomeAdditionalInformationDetailsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_IncomeAndExpensesLineItems" name="IncomeAndExpensesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_MaturityOfGroupReportableLossesLineItems" name="MaturityOfGroupReportableLossesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_ActuarialGainLossOnPostEmploymentBenefitObligationsMember" name="ActuarialGainLossOnPostEmploymentBenefitObligationsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_AnalyticalMethodValidationMember" name="AnalyticalMethodValidationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_ApplicableRateForTwentyTwentyFourAndSubsequentYearsMember" name="ApplicableRateForTwentyTwentyFourAndSubsequentYearsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_ApplicableRateForTwentyTwentyThreeMember" name="ApplicableRateForTwentyTwentyThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_BusinessCombinationAgreementMember" name="BusinessCombinationAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_CommitmentsRelatedToAccureLicenseAgreementMember" name="CommitmentsRelatedToAccureLicenseAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_CommitmentsRelatedToNovartisLicenseAgreementMember" name="CommitmentsRelatedToNovartisLicenseAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_CommitmentsRelatedToRennesUniversityCollaborationResearchAgreementMember" name="CommitmentsRelatedToRennesUniversityCollaborationResearchAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_CommitmentsRelatedToSandozGMPManufacturingAgreementMember" name="CommitmentsRelatedToSandozGMPManufacturingAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_ConditionalShareCapitalMember" name="ConditionalShareCapitalMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_DepreciationOfPropertyPlantAndEquipmentOperatingExpensesMember" name="DepreciationOfPropertyPlantAndEquipmentOperatingExpensesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_DepreciationOfRightOfUseAssetsOperatingExpensesMember" name="DepreciationOfRightOfUseAssetsOperatingExpensesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_EuroCurrencyMember" name="EuroCurrencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_ExpectedPaymentForTwoThousandTwentyFourMember" name="ExpectedPaymentForTwoThousandTwentyFourMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_ExternalServiceProvidersOperatingExpensesMember" name="ExternalServiceProvidersOperatingExpensesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_FivePercentDecreaseInEuroMember" name="FivePercentDecreaseInEuroMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_FivePercentDecreaseInHKDMember" name="FivePercentDecreaseInHKDMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_FivePercentDecreaseInIslandicKronaMember" name="FivePercentDecreaseInIslandicKronaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_FivePercentDecreaseInUSDMember" name="FivePercentDecreaseInUSDMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_FivePercentIncreaseInEuroMember" name="FivePercentIncreaseInEuroMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_FivePercentIncreaseInHKDMember" name="FivePercentIncreaseInHKDMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_FivePercentIncreaseInIslandicKronaMember" name="FivePercentIncreaseInIslandicKronaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_FivePercentIncreaseInUSDMember" name="FivePercentIncreaseInUSDMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_FrenchRetirementPlanMember" name="FrenchRetirementPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_HongKongRetirementPlanMember" name="HongKongRetirementPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_IcelandKronaCurrencyMember" name="IcelandKronaCurrencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_IcelandPensionMember" name="IcelandPensionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_LaboratoryEquipmentMember" name="LaboratoryEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_LeasingMember" name="LeasingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_MandatoryRetirementSavingsMember" name="MandatoryRetirementSavingsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_MaturityYearFiveMember" name="MaturityYearFiveMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_MaturityYearFourMember" name="MaturityYearFourMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_MaturityYearOneMember" name="MaturityYearOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_MaturityYearThreeMember" name="MaturityYearThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_MaturityYearTwoMember" name="MaturityYearTwoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_MenMember" name="MenMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_OfficeEquipmentHardwareMember" name="OfficeEquipmentHardwareMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_OfficeFurnitureAndEquipmentMember" name="OfficeFurnitureAndEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_OperatingExpensesMember" name="OperatingExpensesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_OtherCountryMember" name="OtherCountryMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_OtherCurrencyMember" name="OtherCurrencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_OtherCurrentAssetMember" name="OtherCurrentAssetMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_OtherOperatingExpensesMember" name="OtherOperatingExpensesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_PayrollPersonnelExpenseMember" name="PayrollPersonnelExpenseMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_PersonnelExpenseMember" name="PersonnelExpenseMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_ProcessOptimizationMember" name="ProcessOptimizationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_RestrictedStockAwardsMember" name="RestrictedStockAwardsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_RestrictedStocksMember" name="RestrictedStocksMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_SeriesAPreferenceSharesMember" name="SeriesAPreferenceSharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_SeriesBPreferenceSharesMember" name="SeriesBPreferenceSharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_SeriesBPreferredSharesAndSeriesCPreferredSharesMember" name="SeriesBPreferredSharesAndSeriesCPreferredSharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_SeriesC1aPreferenceSharesMember" name="SeriesC1aPreferenceSharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_SeriesC1bPreferenceSharesMember" name="SeriesC1bPreferenceSharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_SeriesCPreferenceSharesMember" name="SeriesCPreferenceSharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_ShareBasedCompensationPersonnelExpenseMember" name="ShareBasedCompensationPersonnelExpenseMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_SupplementaryRetirementSavingsMember" name="SupplementaryRetirementSavingsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_SwissFrancCurrencyMember" name="SwissFrancCurrencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_SwitzerlandPensionPlanMember" name="SwitzerlandPensionPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_USDollarCurrencyMember" name="USDollarCurrencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_USRetirementPlanMember" name="USRetirementPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_WarrantsMember" name="WarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_WomenMember" name="WomenMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_CashAndCashEquivalentsTable" name="CashAndCashEquivalentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_DisclosureOfBasisOfPreparationAndChangesToGroupAccountingPoliciesTable" name="DisclosureOfBasisOfPreparationAndChangesToGroupAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_DisclosureOfShareCapitalSharePremiumAndTreasurySharesTable" name="DisclosureOfShareCapitalSharePremiumAndTreasurySharesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_DisclosureOtherCurrentAssetsAndAccruedIncomeAdditionalInformationDetailsTable" name="DisclosureOtherCurrentAssetsAndAccruedIncomeAdditionalInformationDetailsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_IncomeAndExpensesTable" name="IncomeAndExpensesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_MaturityOfGroupReportableLossesTable" name="MaturityOfGroupReportableLossesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="ocs_DescriptionOfAccountingPolicyOfCapitalizationOfTransactionCostsExplanatory" name="DescriptionOfAccountingPolicyOfCapitalizationOfTransactionCostsExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DescriptionOfAccountingPolicyOfCurrentVersusNoncurrentClassificationExplanatory" name="DescriptionOfAccountingPolicyOfCurrentVersusNoncurrentClassificationExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DescriptionOfAccountingPolicyOfGroupAccountingExplanatory" name="DescriptionOfAccountingPolicyOfGroupAccountingExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DescriptionOfAccountingPolicyOfPreferredSharesExplanatory" name="DescriptionOfAccountingPolicyOfPreferredSharesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DescriptionOfAccountingPolicyOfStandardAndInterpretationsInIssueNotYetAdoptedExplanatory" name="DescriptionOfAccountingPolicyOfStandardAndInterpretationsInIssueNotYetAdoptedExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfAccruedIncomeExplanatory" name="DisclosureOfAccruedIncomeExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfActivitiesForShareCapitalAndSharePremiumAccountsExplanatory" name="DisclosureOfActivitiesForShareCapitalAndSharePremiumAccountsExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfComponentsOfNetBenefitExpenseExplanatory" name="DisclosureOfComponentsOfNetBenefitExpenseExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfCorporateInformationTextBlock" name="DisclosureOfCorporateInformationTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfCurrentIncomeTaxExpenseAndDeferredTaxExpenseExplanatory" name="DisclosureOfCurrentIncomeTaxExpenseAndDeferredTaxExpenseExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfDeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognisedExplanatory" name="DisclosureOfDeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognisedExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfDetailedInformationAboutAccruedExpensesAndOtherPayablesExplanatory" name="DisclosureOfDetailedInformationAboutAccruedExpensesAndOtherPayablesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfGroupReportableLossesMaturityExplanatory" name="DisclosureOfGroupReportableLossesMaturityExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfIncomeAndExpensesTextBlock" name="DisclosureOfIncomeAndExpensesTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfNetDebt" name="DisclosureOfNetDebt" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfPrincipalAssumptionsUsedForDeterminingPensionBenefitObligationsForGroupPlanExplanatory" name="DisclosureOfPrincipalAssumptionsUsedForDeterminingPensionBenefitObligationsForGroupPlanExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfQuantitativeInformationAboutLeaseLiabilitiesExplanatory" name="DisclosureOfQuantitativeInformationAboutLeaseLiabilitiesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesExplanatory" name="DisclosureOfReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_DisclosureOfResearchAndDevelopmentCommitmentsExplanatory" name="DisclosureOfResearchAndDevelopmentCommitmentsExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_OtherCurrentAssetsAndAccruedIncomeTextBlock" name="OtherCurrentAssetsAndAccruedIncomeTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_ScheduleOfEstimatedUsefulLivesOfPropertyPlantAndEquipmentExplanatory" name="ScheduleOfEstimatedUsefulLivesOfPropertyPlantAndEquipmentExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_ScheduleOfGeographicalAreasTableTextBlock" name="ScheduleOfGeographicalAreasTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_ScheduleOfPotentialDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareTextBlock" name="ScheduleOfPotentialDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_ScheduleOfTradePayables" name="ScheduleOfTradePayables" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_SummaryOfCashAndCashEquivalentsTableTextBlock" name="SummaryOfCashAndCashEquivalentsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="ocs_SummaryOfLongTermFinancialLiabilitiesExplanatory" name="SummaryOfLongTermFinancialLiabilitiesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
</xsd:schema>
