Effect of Blue Light Filters on Tear and Contrast Sensitivity in Individuals Using Electronic Devices

Abstract

Objectives: To investigate the effect of contact lenses with blue light filters on contrast sensitivity and any alteration in tear quantity and quality. Methods: This prospective longitudinal pilot study required three visits by each participant. Monocular visual acuity, contrast sensitivity, phenol red thread test, and tear breakup time were measured at each visit. Results: There were significant differences in logarithmic contrast sensitivity between the groups. The breakup time (BUT) was significantly lower after using video display terminals than before (P,0.05). No differences in BUT were found between groups video display terminals and contact lenses having the blue filter (P.0.05). However, higher mean values were observed in the group after video display terminal use with contact lenses having the blue filter than that with standard contact lenses (P.0.05 in both groups). Furthermore, the mean value of phenol red thread test on the group after video display terminal use with contact lenses having the blue filter was lower than the group before its use (P.0.05). Conclusion:The results establish a possible relationship between tear stability, improved contrast sensitivity, and the use of a blue filter in contact lenses.

Contrast sensitivity function under three light conditions in patients with type 1 diabetes mellitus without retinopathy: a cross-sectional, case–control study

“…The results were collected on the data record sheet provided by the manufacturer, noting the minimum level of contrast that the patient was able to perceive for the four spatial frequencies. Values were transposed to log units by the table listed on the company's website ( http://www.vectorvision.com/csv1000-norms/ ) for curve fitting and analysis [ 22 ].…”

Tear film layers and meibomian gland assessment in patients with type 1 diabetes mellitus using a noninvasive ocular surface analyzer: a cross-sectional case–control study

“…Tear volume was measured by Schirmer’s I test (SIT) [ 20 ], and the invasive analysis of tear film stability was carried out through the fluorescein tear break-up time test (TFBUT) using cobalt blue illumination of a slit lamp (Topcon SL-6E, Japan). TFBUT was the average of the three measures of each eye [ 21 ].…”