Cone Dystrophies: An Optical Coherence Tomography Angiography Study

Area of Science:

• Ophthalmology
• Retinal Imaging
• Neuroscience

Background:

• Cone dystrophies (CDs) are inherited retinal diseases affecting central vision.
• Understanding the relationship between retinal structure and function is crucial for managing CDs.

Purpose of the Study:

• To investigate the association between retinal vascularization and macular function in patients with cone dystrophies.
• To compare retinal structure, vascular density, and function between CD patients and healthy controls.

Main Methods:

• A prospective case-control study involving 20 CD patients and 20 healthy controls.
• Utilized optical coherence tomography angiography (OCTA) for retinal vascularization assessment (SCP, DCP, CC).
• Assessed macular function using microperimetry and electroretinograms (ERG, PERG, mfERG).

Main Results:

• Reduced retinal thickness, superficial capillary plexus (SCP), and deep capillary plexus (DCP) densities were observed in CD patients.
• Significant correlations were found between retinal thickness, SCP, and DCP densities.
• CD patients exhibited significantly reduced PERG and mfERG amplitudes, indicating functional deficits.

Conclusions:

• Cone dystrophies are characterized by reduced retinal thickness and vascular density, potentially due to decreased metabolic demand.
• Vascular density in the retina significantly correlates with functional vision loss in CD patients.