Comparative study of multifocal and monovision contact lenses in presbyopic patients at the Valle de los Chillos optometric center

Abstract

Introduction: Multifocal and monovision contact lenses are designed to provide unique features to the wearer to focus images at different distances without the need to wear frame lenses. Objectives: The effectiveness of the two adaptation techniques was evaluated: conventional monovision and multifocal contact lenses in presbyopic patients. Methodology: This is an analytical and descriptive study, conducted over a period of 6 months, and 9 patients aged 47 to 57 years who attended the optometric consultation were evaluated. Results: In both techniques, adaptation was performed with monthly contact lenses made of comfilcon A material, initially applying the Schirmer I test, the lacrimal meniscus, the BUT (Break-Up Time) test; in addition, the contrast test and the pre- and post-adaptation decimal visual acuity were used to obtain accurate results of both techniques. Statistical analysis was conducted with Student and Wilcoxon t-tests with a 95% confidence interval. Conclusions: A variation was observed in relation to the two techniques. It was determined in a statistically significant way that multifocal contact lenses in near visual acuity are more effective than monovision (Student's paired test P=0.430) (Wilcoxon's paired test P=0.686). In addition, it was found that monovision is more effective in distance visual acuity than multifocal monovision in a statistically significant way (Paired Student t-test P=0.341) (Wilcoxon paired test P=0.317). General area of study: Health. Specific area of study: Optometry. Item type: Original.