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First Author: T.Ferrer-Blasco SPAIN
Co Author(s): S. García-Lazaro L. Belda-Salmerón C. Albarrán-Diego R. Montés-Micó
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To evaluate the effects of a central-hole contact lens (CL)-based design on visual performance and to compare it with the standard version of that same CL without the hole (non-hole scenario).
University of Valencia
In a cross-over-design study, the visual performance of 10 myopic patients wearing either a central-hole myopic CL or its corresponding standard-version (non-hole CL) was assessed on the same eye. For each patient, monocular-corrected distance visual acuity (DVA) was measured under photopic conditions, monocular contrast sensitivity (CS) was measured both under photopic and mesopic conditions and higher-order ocular aberrations using Hartmann-Shack aberrometry. Moreover, an in-vitro optical analysis of both CLs was carried out and a symptoms questionnaire was administered to the participants.
No statistically significant differences in terms of DVA were found: -0.091 logMAR and -0.098 logMAR for the hole and non-hole CLs, respectively (p>0.05). CS was comparable between lenses and no differences were found neither for specific spatial frequencies nor for a particular luminance level (p>0.05). The hole CLs provided excellent outcomes, essentially equivalent to those of non-hole CL, even in terms of subjective symptoms such as glare or halo. In-vivo and in-vitro optical-quality analysis revealed no statistically significant differences between the hole and the non-hole CLs for either pupil size (p>0.1).
A CL having a central hole provides good visual-and optical-quality outcomes, comparable to those yielded by the same lens without a hole. Our results suggest that the impact of a central hole may be considered to be clinically negligible.