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OCT results with, without contact lenses differ

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BOSTON — Retinal nerve fiber layer measurements from two optical coherence tomography systems were found to be significantly different in contact lens wearers, according to a study reported here at Academy 2011 Boston.

Forty-seven eyes from 26 patients with myopia were evaluated in a study conducted by Andrew K.C. Lam, PhD, FAAO, and Jimmy Tse, BSc(Hons), FAAO, BCLA, of Hong Kong Polytechnic Institute. "There was significant difference in retinal nerve fiber layer (RNFL) between the two OCT systems, with a thicker RNFL measured by the Nidek system," according to the poster presentation.

The study evaluated the Nidek RS-3000 OCT and the Cirrus HD-OCT (Carl Zeiss Meditec).

"The Nidek system provided similar RNFL with and without contact lens wear," the researchers reported.

They concluded, "This was similar to recent studies that compared different SD-OCT instruments and concluded that their results could not be interchanged. Although soft contact lens wear could help get a clearer image during acquisition and did not affect RNFL measurement from the Nidek system, soft contact lenses are better removed when using the Cirrus," they reported.

• Disclosure: The authors have no relevant financial disclosures.