This study implemented and evaluated the effectiveness of an expressive writing intervention among patients with Stargardt’s disease, a rare disease due to macular degeneration. Participants were randomly assigned to either an expressive writing intervention or a neutral writing condition. Participants completed measures at three time points: baseline, 3 weeks, and 6 weeks post-intervention. Psychological health outcomes improved at the 3-week follow-up for the intervention condition compared to control. Self-reported physical health improved at the 6-week follow-up in the intervention condition compared to control. These results suggest that expressive writing may be an effective, practical, and low-cost intervention for those with Stargardt’s disease.