Design: This is a prospective qualitative interview study with quantitative questionnaires. Participation will involve up to three interviews with questionnaires over one year. Interviews may take place in person at the National Institutes of Health Clinical Center (NIH CC) or by telephone and will focus on how the interviewee came to the decision to participate (not to participate) in the early-phase ocular gene transfer trial. Interviews will be transcribed verbatim, coded by two independent coders, and analyzed thematically. Participants will also be asked to complete a questionnaire that measures dispositional optimism, resilience, and general mood states using instruments that have been shown to be valid and reliable in both the general population and in clinical samples. Information collected from these surveys will supplement information collected during the qualitative interview and will provide information about constructs that are difficult to assess during a brief interview.