Effect of Induced Accommodation Relaxation Methods on Visual Function in Young Adults

Abstract

Purpose: To evaluated the effect of induced accommodation relaxation methods on visual function in young adults with monovision, modified monovision and multifocal contact lenses of low add power. Materials and Methods: Twenty two young subjects (23.36 ± 2.57 years) were fitted with single vision contact lenses, monovision, modified monovision and multifocal contact lenses with masking method. After wearing the contact lenses for a week for adaptation, binocular contrast visual acuity (VA) at distance and near, stereoacuity, ghost image, legibility, thread a needle and subjective visual performance with questionnaires were evaluated with each of these modalities. All the assessments of visual function were made after 1 hour watching visual display at computer for induced accommodation. Results: There was no difference in binocular 100% distance contrast visual acuity, 100% and 10% near contrast visual acuity between these modalities and single vision as control, however, 10% binocular distance contrast visual acuity was lowest with monovision(p<0.05). Stereoacuity was lowest with monovision compared with other modalities(p<0.05), and there were no significant differences between other modalities. Both of accuracy and speed of legibility worst with monovision compared with other modalities(p<0.05) and there were no significant differences between other modalities. The distance and near visual satisfaction, stereoacuity and adaptation measured with questionnaires, there were no differences between modified monovision, multifocal contact lenses and single vision contact lens, however, those with monovision showed worst satisfaction. Conclusions: There were no differences in visual function in young subjects fitted with low addition of modified monovision, multifocal contact lenses vs single vision contact lenses, however, with monovision contact lenses, low contrast distance visual acuity, steroacuity, legibility and visual satisfaction were decreased.