Author: Cari Pérez Vives, PhD, Alcon Management (Switzerland)
Presbyopia may be corrected with monovision or multifocal contact lenses. Multifocal lenses are based on simultaneous vision, with the overlap of distance, intermediate and near images on the retina and have been reported to provide superior binocular vision and range of clear vision at near acuity relative to monovision, and to preserve stereopsis. In order to understand better these differences we performed a study with 24 presbyopic patients where we compared the visual performance of multifocal and monovision lenses using the objective measurements of stereoacuity, contrast sensitivity, defocus curves and the individual’s subjective ratings of vision with multifocal and monovision lenses. Multifocal lenses showed better defocus curves at intermediate and near ranges, better stereoacuity and contrast sensitivity and higher rates for all subjective parameters evaluated than monovision lenses. This study has been accepted as oral communication at annual clinical conference of the British Contact Lens Association that will take place in Liverpool, United Kingdom, 29-31 May 2015.