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Effect of cataract extraction on automated fields in chronic open-angle glaucoma
W C Stewart1, G M Rogers, C M Crinkley
1Department of Ophthalmology, Medical University of South Carolina, Charleston, USA.
Archives of Ophthalmology (Chicago, Ill. : 1960)
|July 1, 1995
Summary
Cataract surgery in patients with chronic open-angle glaucoma has minimal impact on visual field test results. This study found no significant changes in key visual field metrics after phacoemulsification and trabeculectomy.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Surgical Outcomes
Background:
- Chronic open-angle glaucoma (COAG) is a leading cause of irreversible blindness.
- Cataract extraction is a common procedure, and its effect on glaucoma patients requires careful evaluation.
- Visual field testing is crucial for monitoring glaucoma progression.
Purpose of the Study:
- To assess the influence of cataract extraction on visual field test outcomes in patients with COAG.
- To determine if phacoemulsification and combined trabeculectomy significantly alter visual field parameters.
Main Methods:
- Automated perimetry was conducted preoperatively and postoperatively (within 6 months) in 24 COAG patients.
- Phacoemulsification with combined trabeculectomy was performed.
- Eyes were tested with best-corrected refraction under pharmacological dilation.
Main Results:
- No statistically significant changes were observed in average mean defect, pattern standard deviation, or total decibel loss post-surgery (P > .05).
- These results remained consistent regardless of the preoperative visual field damage severity.
- The study possessed 86.5% power to exclude a 4-dB change in mean defect post-surgery.
Conclusions:
- Cataract extraction appears to have a minimal effect on visual field test results in patients with chronic open-angle glaucoma.
- The findings suggest that visual field testing remains a reliable method for monitoring glaucoma after cataract surgery in this population.