The Effects of Reading on Tear Stability in Soft Contact Lens Wearer
Keywords:Contact lenses, non-invasive tear break up, reading, tear film stability
This study aimed to determine the effects of reading on non-invasive tear break-up time (NIBUT) in soft contact lens wearers and establish the correlation between the Contact Lens Dry Eye Questionnaire-8 (CLDEQ-8) and the NIBUT before and after reading. The demographic questionnaire, Contact Lens Dry Eye Questionnaire-8 (CLDEQ-8), were completed by 18 soft contact lens wearer (36 eyes; 17 females and 1 male). The NIBUT was measured as a baseline using modified bowl perimetry before reading. The subjects were then instructed to read silently for 20 minutes a validated hard copy text. The NIBUT test was administered again following the reading task. This study enrolled a total of 18 contact lens wearers (36 eyes). The mean age of the participants was 22.89 ± 1.687 years, and the mean refractive power of their contact lenses ranged from Plano to -5.75D (1.44 ± 0.504D). Twenty-five eyes (55.6%) of contact lens wearers wore lenses less than -3.00D, while sixteen eyes (44.4%) wore lenses greater than -3.00D. The mean of pre-NIBUT and post-NIBUT were 6.43 secs (SD;1.250) and 3.22 secs (SD;0.964) respectively. The paired t-test revealed a significant difference between pre and post-NIBUT; p< 0.001. CLDEQ-8 had a negative poor correlation with pre-NIBUT (r = -0.266) and post-NIBUT (r = -0.150). The values of NIBUT decreased in soft contact lens wearers after a 20-minute near-reading task. Sustained 20 minutes of reading affects the tear stability, resulting in disruption of the tear film layer, which results in tear film instability as measured by CLDEQ-8 and NIBUT before and after reading. There was little correlation between CLDEQ-8 and NIBUT scores before and after reading.
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