[Assessment of retinal function in cataract by electroretinography]

Area of Science:

• Ophthalmology
• Neuroscience
• Medical Imaging

Background:

• Cataracts can obscure the retina, complicating the assessment of retinal function.
• Accurate diagnosis of retinal abnormalities is crucial for predicting visual outcomes after cataract surgery.

Purpose of the Study:

• To evaluate the utility of electroretinography (ERG) in assessing central and peripheral retinal function in patients with cataracts.
• To determine if ERG can diagnose retinal abnormalities when the fundus is not visible.
• To explore the predictive value of ERG for postoperative visual function.

Main Methods:

• Utilized a 18-20 degree red saturating stimulus for macular ERG and a Ganzfeld white stimulus for total ERG.
• Recorded macular and total ERG responses in patients with varying degrees and types of cataracts.
• Compared ERG findings with normal values and correlated them with the presence or absence of macular pathology.

Main Results:

• Macular ERG in mature cataracts without macular changes matched normal values with medium-intensity stimuli.
• Macular biopotentials differed significantly from normal in cases with macular dystrophy.
• Total ERG values aligned between cataract patients and controls only with saturating white stimuli when no retinal abnormalities were present.
• ERG with weak and medium-intensity stimuli revealed significant differences between patient groups.

Conclusions:

• ERG is a valuable tool for assessing retinal function in cataract patients, particularly when fundus examination is limited.
• ERG can help identify retinal abnormalities and predict visual outcomes post-surgery.
• The findings support extrapolating known ERG patterns to diagnose retinal pathology in the presence of cataracts.