Epiretinal Membrane Impairs the Inner Retinal Layer in a Traction Force-Dependent Manner

Area of Science:

• Ophthalmology
• Retinal Diseases
• Optical Coherence Tomography

Background:

• Epiretinal membrane (ERM) is a common condition affecting the inner retinal layers.
• The mechanical forces exerted by ERMs are thought to contribute to visual impairment.
• Understanding the relationship between ERM-induced traction and retinal layer damage is crucial for patient management.

Purpose of the Study:

• To investigate the correlation between retinal traction force, quantified by the maximum depth of retinal folds (MDRF), and inner retinal layer impairment in patients with ERM.

Main Methods:

• Retrospective analysis of 209 eyes from 201 patients with idiopathic ERM.
• En face OCT was used to measure MDRF; focal macular ERG assessed retinal function.
• B-scan OCT measured inner nuclear layer (INL) and outer nuclear layer (ONL) + outer plexiform layer (OPL) thicknesses; α-SMA expression in ERM was quantified.

Main Results:

• MDRF significantly correlated with reduced b-wave and oscillatory potential amplitudes, and increased INL and ONL+OPL thicknesses.
• INL thickness progression rate was strongly correlated with MDRF progression rate.
• MDRF also showed a significant correlation with α-smooth muscle actin (α-SMA) expression in ERM specimens.

Conclusions:

• The findings indicate that ERM impairs the inner retinal layer through a mechanism dependent on the applied traction force.
• MDRF serves as a quantifiable measure of this traction force and its impact on retinal structure and function.