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Binocular summation in presbyope subjects with monocular pinhole

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Session Details

Session Title: Presented Poster Session: Corneal Inlays

Session Date/Time: Tuesday 08/09/2015 | 09:30-11:00

Paper Time: 09:30

Venue: Poster Village: Pod 2

First Author: : S.García-Lázaro SPAIN

Co Author(s): :    A. Cervino   D. Madrid-Costa   T. Ferrer-Blasco   R. Montes-Mico     

Abstract Details


To determine the effects on visual function of artificial pupils for presbyopia correction, particularly the Pulfrich effect.


University of Valencia


Pulfrich effect was assess in 23 presbyopic patients through artificail pupila contact lens fitting. Four different lens designs were used (1.5 mm, 2.5 mm, 3.5 mm pupil diameters in a 8 mm diameter opaque zone, and a 1.5 mm pupil diameter in a 4 mm diameter opaque zone) and two curvature radii (8.40 and 8.80 mm). Presence of the Pulfrich effect was determined thropugh the lineal movoment of a pendulus located at 1m with a constant illumination of 5 cd/m2. Patient should the tell if the movement was lineal (no Pulfrich effect) or eliptical (Pulfrich effect).


Results show a 30% of patients suffer of the effect with some CL design. The incidence of the Pulfrich is greater as the artificial pupila diameter decrases, reaching its maximum for the 1.5mm pupil size designs with a 90% prevalence. With regards to the direction of the elipse described the Pulfrich is accompanied with an increase of a clock wise perception.


Different surgical techniques for the correction of presbyopia have appeared lately. Some are based on the physical property of the increase in depth of focus through artificial pupils (for example Kamra©). A significant number of post-surgery patients with artificial pupils may experiment a reduction of binocular field of view and night vision, which are the main visual alterations produced by the Pulfrich effect. A significant percentage of subjects percieve the Pulfrich when fitted with artificial pupils, mainly for smaller pupils.

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