Subretinal injection of VGR-R01

Gene Replacement Therapy

An adverse event (AE) is any untoward medical occurrence in a clinical investigation participant administered a product; the event will not need to have a causal relationship with the treatment.

A serious adverse event (SAE) is any untoward medical occurrence at any dose that resulted in death; life threatening; require inpatient hospitalization or prolongation of existing hospitalization; result in persistent or significant disability/incapacity; result in congenital anomaly/birth defect.

Vital signs (temperature, respiratory rate, pulse rate, systolic and diastolic blood pressure) will be obtained with participant in the seated position, after having sat calmly for at least 5 minutes. Clinical significance of vital signs will be determined at the investigator's discretion.

Laboratory Tests will include hematology, coagulation, blood chemistry, urinalysis, serology, and pregnancy test, etc. If any potential changes accompanied by clinical symptoms, or results in a change of medical intervention, the findings will be considered as clinically significant based on investigator's decision.

Ophthalmic Examination will include BCVA, IOP, slitlamp examination, angiography and SD-OCT, etc. If any potential changes accompanied by clinical symptoms, or results in a change of medical intervention, the findings will be considered as clinically significant based on investigator's decision.

BCVA will be assessed for both eyes using the Early Treatment of Diabetic Retinopathy Study (ETDRS) visual acuity (VA) chart. BCVA test should be performed prior to pupil dilation, and distance refraction should be carried out before BCVA is measured. Initially, letters are read at a distance of 4 meters from the chart. If <20 letters are read at 4 meters, testing at 1 meter should be performed. BCVA is to be reported as number of letters read correctly by the participant using the ETDRS Scale (ranging from 0 to 100 letters) in the study eye. The lower the number of letters read correctly on the eye chart, the worse the vision (or visual acuity). An increase in the number of letters read correctly means that vision has improved.