| Título: | Pattern-Related Visual Stress, Chromaticity, and Accommodation |
| Autores: |
Allen, Peter M Hussain, Atif Usherwood, Claire Wilkins, Arnold |
| Fecha: | 2010 |
| Publicador: | |
| Fuente: |
Ver documento |
| Tipo: |
Article PeerReviewed |
| Tema: |
BF Psychology RE Ophthalmology |
| Descripción: | Purpose: To investigate the impact of coloured overlays on the accommodative response of individuals with and without pattern-related visual stress (PRVS), a condition in which individuals manifest symptoms of perceptual distortion and discomfort when viewing a 3 cycles per degree square-wave grating. Methods: Under double-masked conditions, 11 individuals who reported PRVS selected an overlay with a colour individually chosen to reduce perceptual distortion of text and maximise comfort (PRVS group). Two groups of controls, individually matched for age, gender and refractive error were recruited. Control Group 1 similarly chose an overlay as maximising comfort. Control Group 2 used the same overlays as the paired PRVS participant. The overlay improved reading speed by 10% (p<0.001), but only in the PRVS group. Using a remote eccentric photorefractor, accommodative lag was recorded while participants viewed a cross on a background. The background was uniform or contained a black grating and was either grey in colour or had a chromaticity identical to that of the chosen overlay. There were therefore four backgrounds in all. Results: Overall, the accommodative lag was 0.44D greater in the participants with PRVS. When the background had the chosen chromaticity, the accommodative lag was reduced by an average of 0.16D (p=0.03) in the PRVS group, but not in the symptom-free groups: in Control Group 2 the coloured background slightly increased the accommodative lag. Conclusion: Accommodative lag was greater in individuals susceptible to pattern-related visual stress and was reduced by coloured backgrounds. |
| Idioma: | No aplica |