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Comparing the multifocal electroretinogram topography before and after cataract surgery.
Wing-Kin Tam1, Henry Chan, Brian Brown
1Department of Optometry and Radiography, The Hong Kong Polytechnic University, Hong Kong.
Current Eye Research
|July 16, 2005
Summary
Nuclear cataract impacts multifocal electroretinogram (mfERG) topography. Post-surgery, mfERG amplitudes in central retinal areas improved, suggesting cataract affects these measurements.
Area of Science:
- Ophthalmology
- Visual Electrophysiology
Background:
- Nuclear cataracts can alter visual function.
- Multifocal electroretinogram (mfERG) assesses retinal function topographically.
Purpose of the Study:
- To determine if nuclear cataract affects multifocal electroretinogram (mfERG) topography.
- To evaluate changes in mfERG parameters before and after cataract surgery.
Main Methods:
- mfERG recorded from 10 subjects with grade five nuclear cataract (LOCS III) before and after phacoemulsification.
- Visual acuity was 6/12 to 6/18 pre-surgery; follow-up was 2-3 months post-surgery.
- Analysis focused on N1 and P1 amplitudes and latencies of first-order responses across six concentric rings.
Main Results:
- Significant increase in N1 amplitude observed in ring 1 post-surgery.
- Significant increase in P1 amplitude noted in rings 1 and 2 post-surgery.
- No significant changes in N1 or P1 latencies across any rings were detected.
Conclusions:
- Nuclear cataract demonstrably affects mfERG topography.
- Clinicians must consider cataract's influence when interpreting mfERG results in affected patients.