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      <Form990PartVIISectionAGrp>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
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        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>GEORGE B BARTLEY MD</PersonNm>
        <TitleTxt>CEO</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>681720</ReportableCompFromOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>51685</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>MICK ENG</PersonNm>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BRIAN MARTIN</PersonNm>
        <TitleTxt>IT COORDINATOR</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
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      <CompensationFromOtherSrcsInd>1</CompensationFromOtherSrcsInd>
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          <BusinessName>
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          <USAddress>
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            <StateAbbreviationCd>PA</StateAbbreviationCd>
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        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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          <USAddress>
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            <StateAbbreviationCd>IL</StateAbbreviationCd>
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        </ContractorAddress>
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        <ExclusionAmt>174949</ExclusionAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>1727</TotalRevenueColumnAmt>
        <ExclusionAmt>1727</ExclusionAmt>
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      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>4856512</TotalRevenueColumnAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>176676</ExclusionAmt>
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      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>1334082</TotalAmt>
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      <OtherSalariesAndWagesGrp>
        <TotalAmt>519776</TotalAmt>
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      <PensionPlanContributionsGrp>
        <TotalAmt>217861</TotalAmt>
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      <OtherEmployeeBenefitsGrp>
        <TotalAmt>255430</TotalAmt>
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      <PayrollTaxesGrp>
        <TotalAmt>92274</TotalAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>43821</TotalAmt>
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      <FeesForServicesAccountingGrp>
        <TotalAmt>31884</TotalAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
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      <InformationTechnologyGrp>
        <TotalAmt>29051</TotalAmt>
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      <OccupancyGrp>
        <TotalAmt>136503</TotalAmt>
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        <TotalAmt>89224</TotalAmt>
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      <ConferencesMeetingsGrp>
        <TotalAmt>186101</TotalAmt>
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        <TotalAmt>97668</TotalAmt>
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      <InsuranceGrp>
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      <OtherExpensesGrp>
        <Desc>Examination &amp; MOC</Desc>
        <TotalAmt>1188624</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>Program admin</Desc>
        <TotalAmt>350640</TotalAmt>
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      <OtherExpensesGrp>
        <Desc>Admin</Desc>
        <TotalAmt>131969</TotalAmt>
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      <TotalFunctionalExpensesGrp>
        <TotalAmt>4902727</TotalAmt>
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      <CashNonInterestBearingGrp>
        <BOYAmt>278100</BOYAmt>
        <EOYAmt>338019</EOYAmt>
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      <SavingsAndTempCashInvstGrp>
        <BOYAmt>13095</BOYAmt>
        <EOYAmt>13099</EOYAmt>
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      <AccountsReceivableGrp>
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        <EOYAmt>101500</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
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        <EOYAmt>121425</EOYAmt>
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      <LandBldgEquipCostOrOtherBssAmt>425195</LandBldgEquipCostOrOtherBssAmt>
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        <EOYAmt>121643</EOYAmt>
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        <EOYAmt>0</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>175826</EOYAmt>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>1637801</EOYAmt>
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      <OrganizationFollowsSFAS117Ind>X</OrganizationFollowsSFAS117Ind>
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        <BOYAmt>5517243</BOYAmt>
        <EOYAmt>4977673</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>5517243</BOYAmt>
        <EOYAmt>4977673</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>7108710</BOYAmt>
        <EOYAmt>6615474</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>-46215</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>-493355</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleD documentId="RetDoc1040000001">
      <EquipmentGrp>
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        <DepreciationAmt>120827</DepreciationAmt>
        <BookValueAmt>46643</BookValueAmt>
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      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>257725</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>182725</DepreciationAmt>
        <BookValueAmt>75000</BookValueAmt>
      </OtherLandBuildingsGrp>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <RevenueNotReportedFinclStmtAmt>32703</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>4856512</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>4870024</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>4870024</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>32703</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>32703</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>4902727</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>The ABO accounts for uncertainties in income taxes in accordance with authoritative guidance, which presents a recognition threshold of more likely than not to be sustained upon examination by the appropriate taxing authority. Measurement of the tax uncertainty occurs if the recognition threshold has been met. During the year ended 2018, the ABO did not identify any uncertain tax positions that qualify for either recognition or disclosure in the financial statements. Tax returns filed by the ABO are subject to examination by the Internal Revenue Service for a period of three years. While no income tax returns are currently being examined by the internal Revenue Service, tax years since 2015 remain open. The ABO's policy is to recognize interest related to unrelated tax benefits in interest expense and penalties in operating expense.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
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      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>GEORGE B BARTLEY MD</PersonNm>
        <TitleTxt>CEO</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <OtherCompensationFilingOrgAmt>157320</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>681720</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>BETH ANN COMBER</PersonNm>
        <TitleTxt>ADMINISTRATOR</TitleTxt>
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        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>42400</DeferredCompensationFlngOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MICK ENG</PersonNm>
        <TitleTxt>IT MANAGER</TitleTxt>
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        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>27660</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>165660</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Schedule J, Part II, Line 1</FormAndLineReferenceDesc>
        <ExplanationTxt>Dr. Bartley is employed by the Mayo Clinic, where he sees patients and performs surgery one day per week (0.2 FTE). The ABO remunerates the Mayo Clinic for the balance of his professional time (0.8 FTE) all of which is devoted to ABO responsibilities. His compensation is set at 80% (given his 0.8 FTE as ABO CEO) of the 75th percentile for ophthalmology department chairs from a salary survey from the Association of American Medical Colleges. Of note, Dr. Bartley served as Chair of the Mayo Clinic Department of Ophthalmology from 1992 - 2001, and as Chief Executive Officer of Mayo Clinic in Florida from 2002 - 2008. In addition to ABO paying Mayo $524,400 for Dr. Bartley's 80% time commitment in 2018 divided over the 12-month period, ABO shall reimburse Mayo $157,320 or $13,110 each calendar month for as long as this Agreement remains in effect in 2018 for each of the following Mayo benefits provided for Dr. Bartley: Medical; MRA/Dental; FICA; MERP; LTD; Mayo Paid Life; Pension; SRP; Post-Retirement; 401k/403b Plan Match.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Management engages an accounting firm to draft the Form 990. The Form then is reviewed by the ABO's Finance Committee and then by all members of the Board of Directors prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>The ABO's Conflict of Interest policy is sent to all members of the Board of Directors and all employees each year. Each person is required to acknowledge, in writing, receipt and review of the policy and to disclose any known, potential, or perceived conflicts. The Credentials Committee reviews the disclosure forms, seeks further information when potential conflicts are identified, and works with the individuals to eliminate the conflicts. If a board member has a conflict that cannot be eliminated, he or she is recused from any relevant decisions.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The ABO covers board director travel, lodging, and meal expenses (meal reimbursement is limited to $75/day). A per diem of $1,000 is provided to board directors for meeting days that fall during the work week (approximately three days for each meeting). In addition to meetings, the board directors work without compensation approximately 10% or 4 hours per week on ABO-related activities. Total compensation for individual directors may vary based on their participation in additional ABO activities. The CEO's compensation is assessed annually, dependent on performance, and determined by the Finance Committee using a formula based on the Association of American Medical Colleges faculty survey. Staff compensation ranges are determined based on job scope and performance in reference to an independent salary survey that includes both national and local benchmarks. This survey is conducted every two to three years with annual updates.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization's governing documents, conflict of interest policy, and financial statements are available on the ABO website.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Page 7, Part VII, Column B:</FormAndLineReferenceDesc>
        <ExplanationTxt>The CEO is considered a part time employee who works for the ABO at 80% time. This is based on a 50-hour work week. Members of the ABO board of directors spend an average of 10% of a 40-hour work week performing board-related activities. The work varies according to the Director's committee responsibilities. The staff work a standard 40-hour work week.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>