Aspheric Intraocular Lens (IOL) Improves Functional Vision in Mesopic and Scotopic Condition Compared With Coventional Spherical IOL

Abstract

Abstract: : Purpose: To evaluate whether the AS 60 intraocular lens (IOL) with a modified anterior surface provides better quality of vision than a conventional spherical IOL. Methods: 20 eyes of 10 patients who underwent phacoemulsification were randomly implanted with new aspheric acrylic lens AS 60 by Ligi (10 series of eyes) and 10 fellow eyes with AMO AR 40 (Clariflex) ( 5 eyes) and with Acrysoft (Alcon) (5 eyes). Preoperative selection of the patients was done on age and dynamic analysis of the pupil. Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA) and contrast sensivity were detected at 1–7–15 and 30 days postoperatively. The results of sine–wave grating contrast sensitivity under mesopic and photopic conditions were evaluated with two different instruments: SIFIMAV (Sifi) e CSV 1800 (Visitech ) and compared interdividually. Results:The AS 60 provided significantly better contrast sensivity at 6 cycles per degree (cpd) under photopic conditions and at 1.5 and 3 cpd under mesopic conditions. The mean contrast sensitivity in fellow eyes showed that the AS 60 IOL produced significantly better results at some spatial frequencies. Conclusions: The AS 60 IOL with modified aspheric anterior surface may produce better contrast sensitivity and improve the visual acuity than a standard spherical IOL under mesopic and photopic conditions.

Keywords: contrast sensitivity • cataract • pupil