Use of optical filters and visual-perceptual skills in students of the Optometry program at UNAN-Managua, February-August 2020

Abstract

The effect of the use of Optical Filters on visual-perceptual skills, contrast sensitivity, and comfort levels was evaluated in young patients aged 18 to 25 years, enrolled in the Medical Optometry program at UNAN-Managua, from February to August 2020. An experimental study was carried out using a Completely Randomized Design (CRD) model, with a longitudinal section. The statistical analyses carried out were: descriptive, Spearman's Rho, Univariate Analysis of Variance (ANOVA), and Fisher's LSD test. From the analysis and discussion of the results, the following was obtained: The predominant sex was female with 70% of the individuals in the study. The Analysis of Variance of the effect of the use of low, medium, and high wavelength filters showed a causal relationship with the variables Visual Memory with a p= 0.0001; with Visual Sequence Memory with a p = 0.0001; with Gardner II Test with a p= 0.0004 and with Contrast Sensitivity with a p= 0.0001. With the Comfort Sensation in the Contrast Sensitivity Test with a p= 0.0001 and Comfort Sensation in the Visual Acuity Test with a p= 0.0033. Fisher's LSD test showed that the yellow filter presented better clinical values ​​than the absolute control and the red, blue and green filters in the variables Contrast Sensitivity, Gardner II Test, Comfort Sensation for Visual Acuity and Comfort Sensation for Contrast Sensitivity.