A Study to Investigate the Safety of DSP-3077 After a Unilateral Eye Injection in Male and Female Participants 18 Years of Age or Older With Retinitis Pigmentosa

This is a Phase 1/2a, open-label, single-arm, uncontrolled, dose-escalation study evaluating 2 dose levels of iPSC-derived retinal sheets (DSP-3077) administered with a single subretinal uniocular injection in adults with RP. The total duration of participant participation will be approximately 65 months from start of Screening through end of Extension Observation Period Part B. After an initial 2-week period of frequent visits after surgery, the visit frequency will be approximately monthly through Month 4, every 3 months through Month 24, and every 6 months through Month 60. After completion of Study DE101101 (Month 60 Visit or ET Visit) and under a separate process, the Sponsor will collect long-term data following treatment with DSP-3077, annually from 6 years to 15 years after DSP-3077 administration to further characterize the long-term safety of DSP-3077. Participants will be treated in 3 cohorts, with each cohort defined by visual acuity (VA) criteria and dose level of DSP-3077. Each cohort will include 4 participants for a total of 12 participants. Primary objective is to evaluate the safety and tolerability of 2 dose levels of DSP-3077 in adults with RP. Other objectives are to evaluate the safety, engraftment, and potential therapeutic response of 2 dose levels of DSP-3077 in adults with RP and to evaluate DSP-3077-delivery device performance.