Assessment of corneal reflex and vision-related functions among contact lens wearers: a cross-sectional study

Purpose To evaluate the effects of soft, hard, and scleral contact lenses (CLs) on corneal reflex sensitivity and vision-related functions in CL wearers. Methods This cross-sectional study included 89 participants aged 20–45 years, allocated to four groups: soft, hard, scleral, and non-CL wearers (controls). Corneal reflex sensitivity, tear film stability (Schirmer’s test), and visual acuity (Snellen chart) were assessed. The ocular surface disease index (OSDI) and CL dry eye questionnaire-8 (CLDEQ-8) were used to evaluate vision-related function. Data were analyzed using SPSS. Results Scleral CL wearers had the lowest tear production and longest corneal reflex times. Hard CL wearers showed moderate tear production and similar corneal reflex times to scleral lens users. Soft CL wearers had the highest tear film quantity and greater reflex sensitivity, indicating more favorable ocular health. Controls exhibited the greatest tear stability and fastest reflexes. Visual acuity differed significantly, with soft CL wearers achieving the best results among lens users. Scleral lens wearers reported more frequent ocular discomfort, dryness, blurred vision, reading and night driving difficulties, computer and TV-related strain, and sensitivity in windy or low-humidity environments than did individuals in other CL groups. Conclusions CL wear significantly affects tear film production and corneal reflex sensitivity. Soft lenses had the most favorable impact, whereas scleral lenses exhibited the poorest outcomes. Regular ocular examinations and patient education are essential to minimize risks and preserve visual function during prolonged CL use.