Ultrahigh resolution optical coherence tomography in macular dystrophy.

Area of Science:

• Ophthalmology
• Medical Imaging
• Retinal Diseases

Background:

• Macular dystrophies encompass a group of inherited retinal diseases affecting central vision.
• Accurate visualization of intraretinal changes is crucial for diagnosis and management.

Purpose of the Study:

• To utilize ultrahigh resolution optical coherence tomography (UHR OCT) for visualizing and investigating intraretinal alterations in macular dystrophies.
• To compare the morphological differences in adult-onset foveomacular vitelliform dystrophy (AOFVD) and Stargardt's disease (SD)/fundus flavimaculatus (FF) using UHR OCT.

Main Methods:

• A prospective observational case series involving patients with AOFVD and SD/FF.
• Imaging was performed using a new generation UHR OCT system for enhanced visualization of intraretinal layers, particularly the photoreceptor layer.
• Key outcome measures included UHR OCT tomograms detailing deposits, photoreceptor loss, and central foveal thickness.

Main Results:

• Patients with AOFVD exhibited a largely intact photoreceptor layer and subretinal deposits, with a mean central foveal thickness of 142 ± 23 microm.
• Patients with SD showed diffuse degeneration, reduced intraretinal thickness, and central photoreceptor loss, with a mean central foveal thickness of 94 ± 38 microm.
• Significant differences in central foveal thickness were observed between AOFVD and SD/FF groups (P < .001). Fundus flavimaculatus cases presented with pigment epithelial deposits and paracentral photoreceptor loss.

Conclusions:

• UHR OCT is a clinically viable tool for assessing intraretinal changes in macular dystrophies.
• The technology demonstrates potential for visualizing and monitoring photoreceptor atrophy, a key feature of these diseases.
• UHR OCT may serve as an adequate imaging system for tracking disease progression.