Study to Evaluate the Efficacy Safety and Tolerability of Ultevursen in Subjects With RP Due to Mutations in Exon 13 of the USH2A Gene (Sirius)

The purpose of this study is to evaluate the efficacy safety and tolerability of ultevursen administered via intravitreal injection (IVT) in subjects with Retinitis Pigmentosa (RP) due to mutations in exon 13 of the USH2A gene. The below dose levels of ultevursen will be evaluated with the loading dose administered at Day 1 and maintenance dose administered at Month 3 and every 6 months thereafter: 1. Loading dose of 60 µg, maintenance dose of 60 µg 2. Loading dose of 180 µg, maintenance dose of 60 µg Dose levels will include subjects randomized to sham-procedure or treatment with ultevursen.