fa حفظ تیزبینی در شرایط خیرگی در چشم‌های طبیعی کاردرمانی Occupational Therapy پژوهشي Research <strong>Background and Objective:</strong> Glare can affect vision in normal and abnormal individuals. It seems that threshold and normal values of glare have been less mentioned in various sources. The aim of this study was to determine acuity preserve in glare situation in normal subjects.&nbsp;<br> <strong>Methods:</strong> 48 subjects (96 eyes) aged 18 to 25 years with normal visual acuity, and without any refractive error participated in this study. The acuity preserve in glare situation was measured at different light intensity conditions with Metro vision glare test at different luminance and visual field.<br> <strong>Results:</strong> Glare source in each luminance at the nasal side may show better acuity preserve in glare situation. The maximum score for nasal and temporal source for 1 cd/m2 condition was 57.398 and 51.282 respectively. The same situation was seen for 5 cd/m2 (<em>P</em><0.001). However, in glare for luminance background of 1 cd/m2, and 5 cd/m2 were significantly different (<em>P</em><0.001).&nbsp; The acuity preserve in glare situation for 5 cd/m2 background was higher than 1 cd/m2 luminance in both temporal and nasal sides.<br> <strong>Conclusion:</strong> Acuity preserve in glare situation in luminance of 5cd/m2 in both temporal and nasal was more than1 cd/m2. Acuity preserve in nasal glare situation was more than temporal glare situation.<br> &nbsp; Glare, Visual field, visual acuity 29 36 http://fdj.iums.ac.ir/browse.php?a_code=A-10-27-7&slc_lang=fa&sid=1 Zahra Ghasempour قاسم‌پور زهرا 1003194753284600742 1003194753284600742 No MSc. in Optometry, Department of Optometry, Shahid Beheshti University of Medical Sciences, Tehran, Iran کارشناس ارشد بینایی‌سنجی، گروه بینایی‌سنجی، دانشکدۀ علوم توانبخشی، دانشگاه علوم پزشکی شهید بهشتی، تهران، ایران Behnaz Samet بهناز صامت 1003194753284600743 1003194753284600743 No MSc. in Optometry, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran کارشناس ارشد بینایی‌سنجی، بیمارستان فارابی، دانشگاه علوم پزشکی تهران، تهران، ایران Mehdi Khabazkhoob مهدی خبازخوب 1003194753284600744 1003194753284600744 Yes PhD in Epidemiology, Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran دکتری تخصصی اپیدمیولوژی، مرکز تحقیقات اپیدمیولوژی، بیمارستان چشم‌پزشکی نور، تهران، ایران Ebrahim Jafarzadehpur ابراهیم جعفرزاده‌پور 1003194753284600745 1003194753284600745 No Professor of Optometry and Vision Sciences, Department of Optometry, Iran University of Medical Sciences, Tehran, Iran استاد، گروه بینایی‌سنجی، دانشکدۀ علوم توانبخشی، دانشگاه علوم پزشکی ایران، تهران، ایران