Dark Adaptation in Participants With Age-Related Macular Degeneration

Objective: The Dark Adaptation Extension study allows us to continue with the follow-up of participants who were enrolled in the clinical trial, 11-EI-0147, Longitudinal Investigation of Dark Adaptation in Participants with Age-Related Macular Degeneration, investigating long-term changes in dark adaptation in participants with a range of age-related macular degeneration severity who have already been characterized and followed under that protocol.

Study Population: Participants will be recruited from participants already enrolled in 11-EI-0147. Participants will have varying degrees of severity of AMD (Groups 0, 1, 2, 3 and 4). Group 0 (N=40) is defined as participants without AMD meaning no large drusen (>= 125 microns) or advanced AMD in either eye. Group 1 (N=40) is defined as participants with large drusen (>= 125 microns) in the study eye and no large drusen or advanced AMD (choroidal neovascularization (CNV) or geographic atrophy (GA)) in the fellow eye. Group 2 (N=40) is defined as participants with bilateral large drusen (>= 125 microns) with or without retinal pigment epithelial hypo/hyperpigmentary changes. Group 3 (N=40) is defined as participants with large drusen (>= 125 microns) in the study eye and advanced AMD (CNV or GA) in the fellow eye. Group 4 (N=40) is defined as participants with findings of reticular pseudodrusen (RPD) in the study eye, without advanced AMD in the study eye, and any level of AMD in the fellow eye. RPD is defined as having (1) the presence of reticular inter-lacing patterns on at least one en face imaging method (color photography, autofluorescence or infrared) and (2) confirmation of previously described findings of hyper-reflective material located between the retinal pigment epithelium (RPE) and the photoreceptor ellipsoid zone on SD OCT in those areas. Up to 40 diabetic

participants will be recruited.

Design: This is a single center, exploratory, observational, longitudinal evaluation of dark adaptation response in AMD participants who have been followed over five years and will be followed over an additional five years to determine long-term evaluation of DA change as a predictor for AMD progression and VA loss. For the second 5-year study period, participants will have six required study visits (baseline, 12, 24, 36, 48 and 60), continuing on an annual basis following exit from 11-EI-0147, for a total follow-up period of 11 years across both protocols. The windows surrounding each study visit will be plus or minus 6 weeks, except for the baseline visit which will be plus or minus 8 weeks.

Outcome Measures: The primary objective will be to determine mean change, including distribution of change in dark adaptation response between baseline and months 12, 24 and 48 in participants with varying degree of severity of AMD (Groups 0, 1, 2, 3 and 4). Primary outcome data collected at Month 48 will be compared to the initial baseline testing done in 11-EI-0147 which will be 10-year data across both protocols. Dark adaptation parameters will be measured using the AdaptDx technology (including the prototype machine, AdaptRx and the commercially available AdaptDx) and also using the Medmont dark adaptation perimeter. Reproducibility of the AdaptRx and AdaptDx dark adaptometers as well as the Medmont perimeterwill be evaluated in a minimum of 20 participants from Groups 0, 1 and 2 with repeat testing performed one week ( 6 days/+ 14 days) following the baseline visit. The secondary outcomes include the mean change in dark adaptation and other characteristic parameters of the dark adaptation response from baseline at months 12, 24, 36, 48 and 60 from each of the three methods, and the mean best-corrected visual acuity (BCVA) of the study eye from baseline and months 12, 24, 36, 48 and 60.