Up to nine subjects who have participated in the earlier LX101 clinical study, and who meet all study eligibility criteria, will receive LX101 administration in the previously uninjected, contralateral eye to evaluate the safety of bilateral, sequential subretinal administration of LX101.

Inclusion Criteria:

Prior subretinal administration of LX101 (unilateral)

≥ 6 years old Signed written informed consent

Exclusion Criteria:

Prior gene therapy except LX101 Active intraocular or periocular infections Lacking of sufficient surviving retinal cells Prior ocular surgery within six months Retinoid like compounds or precursors were taken within three months Complicating systemic diseases Clinically significant abnormal baseline laboratory values Using of any retinal toxic compounds