Lesion-tailored, Fundus-controlled Perimetry in Geographic Atrophy (GA).

Inclusion Criteria: * Age 65-90 years. * Geographic Atrophy (GA) secondary to dry Age-related Macular Degeneration (AMD) in at least one eye with the following criteria: * GA lesion size between 1 and 15 mm² (≈ 0.4 to 6 disc areas) * GA borders must be at least 500 μm from the edge of the 30° × 25° optical coherence tomography (OCT) image frame * No confluent GA extending into peripapillary atrophy * Receiving intravitreal pegcetacoplan per label (at least one injection before screening). * Best-corrected visual acuity (BCVA) of 0.1 - 1.0 logMAR (≈ 20/20 to 20/200 Snellen) * Able to undergo mesopic FCP and required imaging. * Informed consent provided. Exclusion Criteria: * Currently or previously active exudative macular neovascularization in the study eye. * High refractive errors (\> ±5.00 Diopters \[D\] spherical equivalent) and significant astigmatism (\> 2.50 D). * Ocular comorbidities likely to confound sensitivity or imaging (e.g., diabetic retinopathy with macular edema, retinal vein occlusion (RVO), inherited retinal disease, uncontrolled glaucoma). * Media opacity precluding reliable fundus-controlled perimetry (FCP) or imaging (e.g., dense cataract, corneal opacity, vitreous hemorrhage). * Any systemic condition judged likely to compromise participation, follow-up, or data integrity.