• International Attendees

  • Check your travel documents and passports to ensure that they are up-to-date for AAO 2016 in Chicago.

    Letter of Invitation

    The AAO 2016 letter of invitation - to assist in your visitor visa application process - will be available soon. Please check back for additional information.


    Many international attendees will require a visitor visa to enter the United States. Apply early; for scientific conferences, visa applications should be made no later than 90 days prior to travel.