Cancellation, visas and more

Cancellation & refund policy

The Cancellation and Refund Policy will be as follows:

Cancellation of registration and payment may only be done in writing.
'In writing' includes electronic communications; per email to This email address is being protected from spambots. You need JavaScript enabled to view it.

Registration and payment canceled before April 1, 2022, is refundable but, subject to € 75, - administrative fee.
If applicable, refunds will be processed after ISOO 2022.

Participants canceling after April 1, 2022, will not receive any refund.
In case of cancellation of your registration after April 1, you may transfer your registration and payment to a colleague. The invoice will be revised accordingly to the new participant.

If the ‘International Society Ocular Oncology Nederland’ foundation must cancel the congress due to unforeseen circumstances, the ‘International Society Ocular Oncology Nederland’ foundation will do its best to refund the costs of registration. However, the ‘International Society Ocular Oncology Nederland’ foundation does not hold responsibility for any additional costs, charges, or expenses, including travel costs and hotel accommodation.

Visas & Letters of Invitation


Do I need a visa to enter The Netherlands?Visa Letter of invitation

All congress participants travelling to the Netherlands must present a passport (or approved identity card for EU citizens). Inhabitants from many countries are required to obtain a visa to enter The Netherlands. Participants are encouraged to apply for visas early (at least two months before departure), and to ensure all requested documentation is submitted with the application for Schengen Visa (Visa C). Applications must be submitted in person at the representation of The Netherlands in the respective countries or at a Schengen partner representation, if The Netherlands do not have representation in that country. Participants are urged to contact their nearest Netherlands' embassy or consulate as early as possible to determine where their application should be made and how long this process will take.

Where can I get information?

Ministry of Foreign Affairs, Kingdom of The Netherlands:

Search for The Netherlands' Embassy or Consulate in your country and contact them. You need to apply for Travel Visa C (Tourist Visa).

Travel Visa (Visa C) = If you intend to go to the Netherlands as a tourist, to visit friends or on a business trip for a period not exceeding 90 days and your country does not participate in the Visa Waiver Program, you need a Schengen travel visa (Visa C). This visa is not a work permit.

Letters of Invitation

A Letter of Invitation is an official document that confirms payment of registration fees and extends an official invitation to the paid registrant to attend and participate in the upcoming congress. In other words, it provides the holder with an official reason to come to the Netherlands. It may be required by your organization for administrative purposes and will likely form one of the documents required for visa application if you are from a country that does not have a visa exemption agreement with The Netherlands.

To qualify for a Letter of Invitation, you must meet both of the following criteria:

  • Be registered either as an Ordinary Member or Affiliate Member or non-member
  • Have paid the congress registration fee in full

The ‘International Society Ocular Oncology Nederland’ foundation will not, under any circumstances, provide a Letter of Invitation or visa application paperwork to any interested party who does not meet the two criteria listed above.

To apply for a Letter of Invitation, please send an email to This email address is being protected from spambots. You need JavaScript enabled to view it. with your full name, date of birth, country of residence, passport number and expiry date. If your application for a Letter of Invitation is successful, your Letter of Invitation will be sent to you by email as a PDF attachment. 

Please ensure you allow sufficient time for your application to be processed.


The Local Organizing Committee team has applied for accreditation at:

  • 'Nederlands Oogheelkundig Gezelschap' (NOG)
  • Participants from abroad will receive a Certificate of Attendance
    (6 hours per day, 3 hours for half a day)

As soon as the accreditation is granted the points will be published here.


20th Congress Of The International Society Of Ocular Oncology

Date: Friday, June 17 - Tuesday, June 21, 2022

Fletcher Wellness-Hotel Leiden
Bargelaan 180
2333 CW Leiden, The Netherlands

Organizing Secretariat  

For organizational, exhibition and sponsor questions please contact:
Jeannette van Namen – JvN Congres Management -
Martijn Reinhold – ReinHolding Meetings –
For registration, payment and abstract issues please contact:
Lilian Heemstra - Status Plus
Oscar Rangel - Status Plus