Primary Objective:

To evaluate the long-term safety and tolerability of SAR422459 in patients with Stargardt's Macular Degeneration.

Secondary Objective:

To assess:

• Safety
• Biological activity

Patients will be followed for 15 years after completion/early termination from the previous TDU13583 study (NCT01367444).

As the initial TDU13583 study is terminated - recruitment to this LTS13588 study is over with 27 patients enrolled.

Inclusion Criteria:

Patients must meet ALL of the following criteria:

1. Provide signed and dated written informed consent and any locally required authorization (e.g., Health Insurance Portability and Accountability Act [HIPAA])
2. Must have been enrolled in protocol TDU13583 (SG1/001/10)
3. Must have received a subretinal injection of SAR422459
4. Must have completed protocol TDU13583 to Week 48 or undergone an early discontinuation visit.

Exclusion Criteria:

The following would exclude Patients from participation in the study:

1. Did not receive SAR422459 as part of the TDU13583 protocol.

Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org