Normal to supernormal 30-Hz flicker ERGs predict visual function and prognosis in central retinal artery occlusion

Area of Science:

• Ophthalmology
• Neuroscience
• Retinal Diseases

Background:

• Central retinal artery occlusion (CRAO) is a serious condition leading to vision loss.
• Electroretinography (ERG) is a diagnostic tool used to assess retinal function.
• The 30-Hz flicker ERG measures the retina's response to rapid light stimulation.

Purpose of the Study:

• To investigate the association between normal to supernormal 30-Hz flicker ERG amplitudes and visual function/prognosis in CRAO patients.
• To determine if ERG findings can predict outcomes in central retinal artery occlusion.

Main Methods:

• Analyzed 30-Hz flicker ERG amplitudes in 133 patients with unilateral acute non-arteritic CRAO.
• Categorized patients into supernormal (≥110%), normal (90-110%), and subnormal (<90%) ERG amplitude ratio groups.
• Correlated ERG parameters with visual acuity and prognosis at 1-month and final follow-up.

Main Results:

• 30-Hz flicker ERG parameters significantly differed based on CRAO severity (incomplete vs. complete).
• Normal to supernormal ERG groups showed significantly better visual acuity (BCVA) and visual improvement at both 1-month and final follow-up compared to the subnormal group.
• The proportion of normal to supernormal flicker ERGs was higher in incomplete CRAO.

Conclusions:

• Normal to supernormal 30-Hz flicker ERG findings in CRAO are linked to less severe retinal ischemia.
• These ERG patterns predict better visual function and prognosis compared to subnormal ERG responses.
• 30-Hz flicker ERG can serve as a valuable prognostic indicator in central retinal artery occlusion.