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A prospective study examining the changes in factors that affect visual acuity following trabeculectomy
I A Cunliffe1, R B Dapling, J West
1Department of Ophthalmology, Royal Hallamshire Hospital, Sheffield, UK.
Eye (London, England)
|January 1, 1992
Summary
Trabeculectomy surgery often causes temporary vision changes, primarily a myopic shift due to altered anterior chamber depth. Vision typically recovers within three weeks, with minimal long-term acuity loss.
Area of Science:
- Ophthalmology
- Surgical Outcomes
Background:
- Patients frequently report subjective visual disturbances after trabeculectomy.
- Understanding these post-surgical visual changes is crucial for patient management.
Purpose of the Study:
- To investigate the causes of visual changes following trabeculectomy.
- To quantify the refractive and biometric alterations contributing to these changes.
Main Methods:
- Prospective study involving 16 eyes undergoing trabeculectomy.
- Assessment of uncorrected Snellen acuity, refraction, anterior chamber depth, and corneal parameters.
Main Results:
- 94% of eyes showed altered uncorrected acuity at 1 week, mainly a myopic shift linked to anterior chamber depth changes (1mm shift ≈ 2 diopters).
- Visual acuity generally returned to baseline by week 3; no significant corrected acuity loss observed thereafter.
- Early post-operative reduction in vertical corneal radius and with-the-rule astigmatism were noted, resolving over time.
Conclusions:
- Post-trabeculectomy visual changes are common, primarily refractive, and usually temporary.
- Patient counseling regarding potential pre-operative visual alterations is recommended.