Structural Changes Associated with Delayed Dark Adaptation in Age-Related Macular Degeneration

Area of Science:

• Ophthalmology
• Retinal Imaging
• Visual Electrophysiology

Background:

• Age-related macular degeneration (AMD) is a leading cause of vision loss.
• Dark adaptation (DA) is a crucial visual function often affected in early AMD.
• Understanding the link between retinal structure and DA is vital for AMD management.

Purpose of the Study:

• To investigate the association between optical coherence tomography (OCT)-based macular morphology and dark adaptation (DA) in patients with AMD.
• To determine if specific OCT-identified abnormalities correlate with impaired DA.

Main Methods:

• A prospective, cross-sectional study involving patients with AMD and a control group.
• Spectral-domain OCT and color fundus photography were used for macular imaging and AMD staging.
• Dark adaptation testing was performed using the AdaptDx protocol, with results mapped to OCT B-scans for analysis.

Main Results:

• Macular abnormalities, both within the DA testing spot and in the broader macula, were significantly associated with delayed dark adaptation times (impaired DA).
• Subretinal drusenoid deposits and ellipsoid zone disruption were consistent predictors of impaired DA, regardless of their location.
• Classic drusen and serous pigment epithelium detachment within the testing spot also correlated with impaired DA.

Conclusions:

• Macular morphology, as assessed by OCT, is significantly linked to dark adaptation.
• Subretinal drusenoid deposits and ellipsoid zone changes are strongly associated with impaired dark adaptation in AMD patients.
• OCT imaging provides valuable insights into the functional impact of structural changes on DA.