The effect of optometric room illumination on visual functional tests
| Autor: | HSU, CHIEN-HUI, 徐千惠 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 The importance of visual measuring is a reference for measurable visual function, there are many factors that effects visual acuity, such as refractive status, definition of refractive medium and environmental illumination, the visual acuity measurement can be used to determine whether there is a change in visual performance. Many parameters of measuring visual acuity have been standardized, including the size of optotypes, chart distance, instructions on testing procedures and the record of visual acuity, however, for the illumination of the optometric room, the measurement of visual acuity is less discussed. The environmental illumination of a common optometric room is only suitable for standard visual function measurements and cannot be used to estimate functional vision under different environmental illumination levels. This study establishes the standard of visual performance under different environmental illumination as the basis for optometric personnel to evaluate visual function. This study simulates five environmental illumination of 300, 200, 150, 100 and 30 ~ 50 lux according to the indoor environmental illumination specifications of the Chinese National Standards. The study included 30 subjects over the age of 20, and exclude who has eye diseases, using atropine, strabismus and amblyopia. We measured the objective diopter, corneal curvature, axial length and corneal thickness. The long-distance ( 6m ) visual acuity and pupil size were measured under five illuminations using a projector chart and visual acuity card, and the results were analyzed by SPSS statistical software. None of the subjects participating in the study had any eye diseases, by simulating different environmental illumination and measuring their visual acuity. It was found that there was no significant difference in visual acuity between the two visual acuity charts under 150 lux illumination, the illumination can be defined as environmental brightness and the visual acuity between the two eye charts is linear. The projector chart has better visual performance in lower environmental illumination, while the visual acuity card is better in visual acuity with higher environmental illumination, and the inference is related to the contrast of the visual standard. The visual acuity will change due to illumination, this study provides different environmental illumination ranges (300, 200, 150, 100, 30 ~ 50 lux), observe whether the subject has other visual impairments through different illumination. This study establishes the standard of visual performance under different environmental illumination, and provides the basis for optometric personnel to assess whether patients have functional visual impairment in daily life. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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