Journal
CORNEA
Volume 40, Issue 10, Pages 1309-1315Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/ICO.0000000000002656
Keywords
dry eye disease; visual quality; tear film analysis; video display terminals; computer vision syndrome; tears break-up time; optical quality metrics; double-pass aberrometer; smartphone screen
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A study on healthy subjects found that prolonged reading on a smartphone screen significantly affects tear film stability and worsens retinal image quality. Results showed a significant reduction in break-up time-related parameters after reading, while the Objective Scatter Index significantly worsened.
Purpose: To evaluate the impact of a prolonged reading session on a smartphone screen on optical quality metrics and tear film stability. Methods: This prospective study was conducted in 41 healthy volunteers who were asked to read an article on a smartphone screen for 20 minutes. The following tests were performed before the reading task in this consecutive order and repeated after the reading task in the same order: automated noninvasive tear break-up time, optical quality assessment including Objective Scatter Index (OSI), modulation transfer function, Strehl ratio, and tear film dynamic analysis as follows: vision break-up time (VBUT) as a function of OSI changes within 20 seconds, using a double-pass aberrometer imaging system, and fluorescein tear break-up time (FBUT) measured using the slit lamp. Results: All break-up time-related parameters (noninvasive tear break-up time, FBUT and VBUT) were significantly reduced after the reading task (P < 0.01). The OSI was significantly worsened after the reading task (P = 0.01), whereas all the other optical quality metrics (modulation transfer function and Strehl ratio) slightly deteriorated, were not statistically significant. A significant correlation was found between the shortening of the FBUT, VBUT, and the worsening of the OSI (r = -0.33, P < 0.05). Conclusions: A reading session on a smartphone screen in healthy subjects was found to significantly affect the tear film stability and objectively worsen the retinal image quality.
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