Aim: To determine the value of a topical carbonic anhydrase inhibitor for extended treatment of cystoid macular oedema (CME) in patients with retinitis pigmentosa (RP).
Method: Eight patients with RP and foveal cystic-appearing lesions observed on fundus examination and by optical coherence tomography (OCT) testing were treated with a topical form of carbonic anhydrase inhibitor.
Results: Foveal cystic-like spaces were documented by OCT testing in all eight patients before treatment. All patients had a significant reduction in their foveal thickness (FT) and foveal zone thickness (FZT) in at least one eye after using 2% dorzolamide three times a day for 1 or 2 months. Six patients had an improvement in both eyes. After an additional 6–13 months of the same treatment regimen, out of six patients who had a sustained reduction in FT and FZT in at least one eye, four had this reduction in both eyes. While they were still taking Trusopt, a recurrence (rebound) of CME in both eyes was observed in two patients, whereas one patient had a sustained improvement in one eye and rebound of CME in the other eye. Out of 8 patients, 3 showed an improvement in their visual acuity by ⩾7 letters, in at least one eye, on Snellen acuity charts, which was determined as clinically significant.
Conclusion: Results from this study suggest that patients with RP could potentially sustain a beneficial effect from continued treatment with a topical form of carbonic anhydrase inhibitor.
- BCVA, best-corrected visual acuity
- CME, cystoid macular oedema
- FT, foveal thickness
- FZT, foveal zone thickness
- OCT, optical coherence tomography
- RP, retinitis pigmentosa
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Published Online First 10 January 2007
Funding: This study was supported by funds from the Foundation Fighting Blindness, Owings Mills, Maryland; The Grant Healthcare Foundation, Chicago, Illinois; NEI core grant EY01792, Bethesda, Maryland; and an unrestricted departmental grant from Research to Prevent Blindness, New York, New York, USA.
Competing interests: None.