Prescreening Study to Identify Potential Stargardt Participants for ACDN-01 Clinical Trials

Key Inclusion Criteria:

• Presence of mutations in the ABCA4 gene

• ABCA4 retinopathy phenotype (Stargardt disease type 1 or cone-rod dystrophy)

Key Exclusion Criteria:

• The presence of pathogenic or likely pathogenic mutations in other genes known tocause cone-rod dystrophy or Stargardt maculopathy

• Retinal disease other than ABCA4-related retinopathy

• Presence of a medical condition (systemic or ophthalmic), psychiatric condition,including substance abuse disorder, or physical examination or laboratory findingthat may in the opinion of the principal investigator and sponsor preclude adherenceto the scheduled study visits, safe participation in the study, or affect theresults of the study.