Structure-Function Analysis in Patients With Intermediate Age-Related Macular Degeneration.

Area of Science:

• Ophthalmology
• Retinal Imaging
• Vision Science

Background:

• Intermediate age-related macular degeneration (AMD) involves sub-retinal pigment epithelium (RPE) material accumulation.
• Understanding the structural and functional changes in AMD is crucial for disease management.

Purpose of the Study:

• To investigate the topographic relationship between retinal structure and visual sensitivity in intermediate AMD.
• To correlate retinal morphology with mesopic and scotopic sensitivity using fundus-controlled perimetry (FCP).

Main Methods:

• Prospective study involving 35 eyes with intermediate AMD and 29 controls.
• Spectral-domain optical coherence tomography (SD-OCT) for retinal layer thickness.
• Mesopic and scotopic FCP using a 56-stimulus grid to assess visual sensitivity.
• Pointwise structural-functional analysis comparing AMD patients to age-matched controls.

Main Results:

• Patients showed reduced mesopic (16.9 ± 3.0 dB) and scotopic (14.0 ± 3.7 dB) sensitivity, particularly in the central macula.
• Reduced sensitivity correlated with increased retinal pigment epithelium-drusen complex (RPEDC) thickness and decreased outer nuclear layer (ONL) and photoreceptor (PR)-segments thickness.
• Structure-function analysis confirmed that decreased sensitivity was linked to increased total retinal and RPEDC thickness and reduced ONL and PR-segments.

Conclusions:

• Sub-RPE material accumulation in intermediate AMD is spatially linked to structural retinal changes and functional vision loss.
• Topographic analysis of retinal thickness and sensitivity provides insights into AMD pathogenesis.
• This approach can aid in evaluating novel therapeutic interventions for AMD.