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RESEARCH PRODUCT

Stereoacuity After Refractive Lens Exchange With AcrySof ReSTOR Intraocular Lens Implantation

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Purpose: To evaluate stereoacuity before and after refractive lens exchange (RLE) with AcrySof ReSTOR intraocular lens (IOL) implantation. Methods: Stereoacuity was measured using the Titmus stereotest at 40 cm under photopic conditions (85 cd/m 2 ) before and after RLE with bilateral AcrySof ReSTOR Natural (SN60D3 model) implantation in 30 hyperopic eyes of presbyopes with low astigmatism (⩽1.00 diopter [D]). Stereoacuity measurements after implantation were compared with those found before surgery. Results: Stereoacuity was unchanged after RLE with pseudoaccommodative IOL implantation. In this population of non-cataractous hyperopes with excellent preoperative stereoacuity (46.42±1.36 sec arc), 95% maintained the same level of stereoacuity (48.67±1.13 sec arc) after surgery ( P =.223). Further calculations predict that this ability to discriminate objects in depth extends to approximately 2 m. Beyond this distance, depth discrimination does not help the visual system. Conclusions: Refractive lens exchange with AcrySof ReSTOR IOL implantation does not affect the binocular ability of the human eye regarding depth perception, the best evidence of binocular function in hyperopic individuals. [ J Refract Surg . 2009;25:1000–1004.]