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Y. Takahashi, M. Igaki, A. Suzuki, G. Takahashi, M. Dogru, K. Tsubota; The Effect Of Periocular Warming On Near Reflex . Invest. Ophthalmol. Vis. Sci. 2006;47(13):5858.
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The effect of a warming sheet for improving eyestrain induced by visual display terminal tasks (VDT) was investigated by measuring near reflex parameters, including amplitude of accommodation, pupillary reaction and convergence reaction.
Males and females aged 25 years or older who experienced eyestrain were recruited, and 10 healthy subjects (mean age 32 years) without dry eye and whose amplitude of subjective accommodation was 3–10D were enrolled in this study. The subjects were randomly divided into two groups of 5: Group A in which the periocular region was warmed using the warming sheet after a 2–hour loading with a VDT task on the first day but simply closed after the same loading period on the 7th day; and Group B in which the eyes were simply closed after the 2–hour loading period on the first day, and then the periocular region was warmed using the warming sheet after the same loading period on the 7th day. The following tests were performed before and after the loading test and after warming or closing the eyes: far and near vision, dry eye (DR1, KOWA), changes of pupil diameter (Tri–Iris, Hamamatsu Photonics), objective amplitude of accommodation (AA1, NIDEK), and subjective amplitude of accommodation (Kowa NP accommodometer, KOWA).
Three subjects in Group B dropped out for personal reasons, therefore, 10 eyes from 5 subjects in Group A and 4 eyes from 2 subjects in Group B were included. In the dry eye examination, subjects in both groups measured 2.6–2.8 points both before and after the loading period. There was no significant improvement in objective or subjective amplitude of accommodation or in pupil diameter changes after the loading period or after closing the eyes, but there was a significant improvement after warming the eyes (p<0.01). There were no significant changes in far or near vision after closing or warming eyes.
Our results indicated that periocular warming influenced an improvement of near reflex.
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