alez-M eijome JM. Comparison of short-term light disturbance, optical and visual performance outcomes between a myopia control contact lens and a single-vision contact lens.
Computer vision syndrome (CVS) describes 'a group of eye and vision-related problems that result from prolonged computer, tablet, e-reader and cell phone use'. 1 Complaints of ocular dryness represent one of the main groups of CVS symptoms 2 and are often encountered in otherwise healthy patients. 3 Research conducted over the last decade reported significantly higher dry eye signs and symptoms in digital display users compared with nonusers. [4][5][6][7] Consequently, digital display use has been listed by the Tear Film and Ocular Surface (TFOS) Dry Eye
Objectives: To assess and compare the effectiveness of four main management strategies for preventing short-term effects of digital display use on dry eye signs and symptoms. Methods: The ocular surface, tear film, and visual fatigue of 47 healthy individuals were assessed before and after reading on a laptop computer for 20 min under five different experimental conditions: control, instillation of artificial tears, taking a brief break, using a blue light screen filter, and blink control. Measurements included the Ocular Surface Disease Index (OSDI) Questionnaire, 5-item Dry Eye Questionnaire (DEQ-5), tear meniscus height (TMH), noninvasive keratograph break-up time (NIKBUT), bulbar conjunctival redness, and pupil size. Results: Worse results were obtained after the control and blue light filter conditions in all variables (P#0.037). A higher post-task DEQ-5 score (P¼0.013) and TMH (P,0.0005) were obtained when taking a brief break compared with pretask, although the increase in symptoms was significantly smaller than that observed in the nonmanagement control condition (P#0.036). Similarly, a smaller increase in OSDI and DEQ-5 was obtained with the use of artificial tears and blink control in comparison with the control condition (P#0.008), whereas a greater increase in DEQ-5 and decrease in NIKBUT was obtained for the blue light filter condition in comparison with the instillation of artificial tears (P¼0.017) or blink control (P¼0.008), respectively. Finally, a significantly lower post-task pupil size was obtained for all the conditions (P#0.027). Conclusions: The instillation of artificial tears and blink control were the best management strategies for preventing short-term effects of digital display use on dry eyes. Conversely, using a blue light filter did not offer any benefits.
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