Repercusiones laborales en usuarios de pantallas de visualización de datos tras cirugía refractiva.
ABSTRACT Purpose: To evaluate the influence in perceived quality of vision and in labour environment of video display terminal (VDT) users related to improvement of visual functions following excimer laser in situ keratomileusis (LASIK). Methods: Longitudinal and observational study in a population of 96 patients that underwent LASIK using a questionnaire made for that, applied before and after surgery by an independent observer. Patients between the ages of 21 and 60 years old, 54 women and 42 men. With refractive errors between 1 and 10 of myopia, +3 and +6 D of hyperopia and an associated astigmatism with myopia or with hyperopia larger or equal to 2.5 D. Results: Quality of vision showed to be better after LASIK (p<0.05). Before surgery vision quality was perceived by 61.42 % of patients like good or excellent, while after surgery it was 78.87 %. Quality of vision without correction is also better after LASIK (p < 0.05). Before surgery quality of vision was perceived by 61.46 % of patients as unacceptable, while 63.54 % of patiens say is acceptable or good. 79.17 % patients were satisfied with the obtained results. Visual acuity and ocular refraction have improved after LASIK, being the efficiency index 1.1. Contrast sensitivity postoperative improved at all spatial frequencies in the right eye (6 c/g, 3 c/g and 1 c/g). While in the left eye there were no significant differences. Some symptoms like ocular burning, reading problems, distorsion in details vision and headache were less frequent after LASIK. However, halos (75 % of patients) and glare (68.75 % of patients) after surgery were frequently reported. With regard to work conditions associated with video display terminals (VDT), after surgery patients need to rest less frequently at work for asthenopia. On the other hand, after surgery, 47.9 % of workers were more participative at work. The length of pauses were not appropiate and environment luminosity is bigger than the screen luminosity for 56.25 % of workers. Conclusions: The results show that LASIK improves visual function of patients, quality of perceived vision and comfort at work with VDTs.
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Advisor:Alió Sanz, Jorge L.; Lobato Cañón, José Rafael
School:Universitat de València
Source Type:Master's Thesis
Date of Publication:10/20/2006