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R.–H.Y. Asaria, L. Garnham, Y. Ramkissoon, J. Sloper, Z. Gregor; Analysis of binocular visual function before and after epiretinal membrane surgery . Invest. Ophthalmol. Vis. Sci. 2004;45(13):1987.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To establish whether successful unilateral epiretinal membrane (ERM) surgery improves binocular visual function. Methods: This is a prospective study of 27 patients undergoing unilateral ERM removal. Pre– and post–operative data is currently available on 13 patients. All patients underwent full orthoptic evaluation, including assessment of stereoacuity using TNO, Wirt and Frisby methods. Prism fusion ranges for near and distance were also recorded. Mean post–operative follow up was 3.2 months. Results: Snellen visual acuity improved in 8 of the 13 operated eyes for which data is currently available. Fellow eye acuities were 6/9 or better, except for one patient with a fellow eye vision of 6/12. Pre–operatively, all 8 patients had demonstrable stereopsis using the Wirt stereo test, 3/8 had a positive response with the Frisby test and 5/8 with the TNO. The prism fusion range was within normal limits in 5 patients (63%) for near and distance before surgery. Post operatively, stereoacuity measured by the Wirt test improved in 6 (75%) patients to a best of 40 seconds of arc. Frisby stereoacuity also showed improvement in 5 cases (63%) to a best level of 20 seconds of arc. There was no overall change in stereoacuity as assessed by TNO. Five patients reported a subjective improvement in distance judgement. Conclusions: Most patients with improved Snellen visual acuity following epiretinal membrane surgery also show improvement in binocular visual function using both objective and subjective criteria.
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