Study to Evaluate Ultevursen in Subjects With Retinitis Pigmentosa (RP) Due to Mutations in Exon 13 of the USH2A Gene

Inclusion criteria

• ✓. An adult (≥18 years) willing and able to provide informed consent for participation prior to performing any study related procedures
• ✓. OR A minor (8 to \<18 years) able to provide age-appropriate assent for study participation with a parent or legal guardian willing and able to provide written permission for the subject's participation prior to performing any study related procedures. An adult willing to comply with the protocol, follow study instructions, attend study visits as required and willing and able to complete all study assessments, in the opinion of the Investigator.
• ✓. Both eyes exhibit clinical presentation consistent with RP involving Usher syndrome type 2 or NSRP based on ophthalmic, audiologic, or vestibular examinations. At screening, the Investigator will make the clinical diagnosis of "Usher syndrome type 2a," defined as RP with congenital hearing loss, or "non-syndromic RP," defined as RP without congenital hearing loss.
• ✓. A molecular diagnosis of biallelic disease causing variants (pathogenic or likely pathogenic) in the USH2A gene where at least one of the variants is located on exon 13. A historic genotyping report from a certified laboratory is acceptable with Sponsor approval.
• ✓. Clearly visible and measurable SD-OCT horizontal EZ width of ≥2.2 mm in both eyes based on the assessment of the CRC.
• ✓. BCVA ≥55 letters based on ETDRS (equivalent to 20/80 based on Snellen notation, or logarithm of the minimum angle of resolution \[logMAR\] +0.6) in both eyes.
• ✓. Impairment of VF as assessed by SP with a mean sensitivity greater than 4 decibels (dB) and less than 25 dB measured by a V target size in the TE at screening.
• ✓. Mean sensitivity greater than 2 dB as determined by MP in the TE at screening.

Exclusion criteria