You are invited to participate in a research study that is directed at learning more about the causes of visual problems during ultramarathons. You may participate in this study if you have ever had significant vision problems during an ultramarathon.

The main purpose of the study is to determine the characteristics associated with visual problems during an ultramarathon.

Your participation will involve completion of the following questionnaire. The questionnaire will require about 10-15 minutes to complete.

You may reach the Investigator, Dr. Marty Hoffman, to discuss any questions or concerns you have about this study at (916) 843-9027 or He is associated with the VA Northern California Health Care System. If you have questions regarding your rights as a research subject, or if problems arise which you do not feel you can discuss with the Investigator, please contact the Institutional Review Board Office at (916) 366-5359.

The information collected in this study will not be especially sensitive information, but we will do our best to make sure that the information we gather will be kept private. However, we cannot guarantee total privacy.

Your completion of the survey serves as your consent to participate in the study.

We very much appreciate your interest and participation in this study.

Marty Hoffman, MD

PLEASE NOTE: If you want to return to a prior page, use the “Prev” button at the bottom of the page rather than the “Back” button on your web browser.

* 1. Have you ever had significant vision difficulties, not including hallucinations, during an ultramarathon?