CLINICAL PERFORMANCE OF A POSTERIOR SURFACE ASPHERIC RIGID GAS PERMEABLE CONTACT LENS FOR THE CORRECTION OF PRESBYOPIA

Title CLINICAL PERFORMANCE OF A POSTERIOR SURFACE ASPHERIC RIGID GAS PERMEABLE CONTACT LENS FOR THE CORRECTION OF PRESBYOPIA
Author, Co-Author S. Eiden, Giovanna Olivares, G. Petito, Michael Shapiro, Douglas Brederson
Topic
Year
1992
Day
Monday
Program Number
Poster 5
Room
Great Hall
Affiliation
Abstract A recently introduced posterior surface aspheric rigid gas permeable contact lens for the correction of presbyopia (Unilens R.G.P. Aspheric Multifocal) was evaluated for clinical performance. 131 patients (261 eyes) were empirically fit according to keratometric and refractive findings or over-refraction of spherical base rigid contact lenses. The posterior apical radius (base curve) of the aspheric R.G.P. was fit 1.50 diopters steeper than the flat meridian keratometric finding, or 1.50 diopters steeper than the base curve of a spherical base rigid contact lens which fit the cornea with an alignment fluorescein pattern. The central distance power (labeled lens power) was determined by accounting for a +1.25 diopter central tear lens. Overall diameter was standard (9.5mm). All patients were previously adapted rigid gas permeable contact lens wearers. Analysis of the empirically fit aspheric lens performance indicated that 72.03% (188 of 261) of the eyes achieved monocular distance and near visual acuities equal to, or better than 20/25. Overall clinical success, as defined as the achievement of binocular distance and near visual acuities of equal to, or better than 20/25, with less than a two line difference between the eyes in monocular acuities, was 74.01% (97 of 131 patients). Clinical indications, suggested fitting techniques, and problem solving with the Unilens R.G.P. Aspheric Multifocal design will also be presented. Study funded by Unilens Corp., USA.
Affiliation of Co-Authors
Outline