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Takashi Suzuki, Takashi Itokawa, Shizuka Koh, Yuichi Hori; Functional visual acuity in rigid gas permeable contact lens wearers. Invest. Ophthalmol. Vis. Sci. 2019;60(9):6378.
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© ARVO (1962-2015); The Authors (2016-present)
To examine visual function in rigid gas permeable (RGP) contact lens wearers using the functional visual acuity (FVA) test and to investigate relationships between visual function and conditions of contact lens and eye.
The study involved 36 female subjects (44.97±8.14 years) who had worn RGP lens on a daily basis. Conventional decimal visual acuity (baseline VA) while wearing RGP lens was estimated. The FVA, visual maintenance ratio (VMR), maximum and minimum visual acuity, response time, and number of blinks were assessed using the FVA Measurement System. Deposits and scratches on RGP lens were scored as follows; (0: none; 1: slight, <1/3 of lens area; 2: slight, >1/3 and <2/3 of lens area; 3: slight, >2/3 of lens area; 4: severe, <1/3 of lens area; 5: severe, >1/3 and <2/3 of lens area; and 6: severe, >2/3 of lens area). Lid height after removing lens was assessed as marginal reflex distance (MRD).
Visual function and ocular and lens conditions were compared between short- (less than 1 year) and long-term (more than 1 year) RGP lens use. The baseline VA, FVA, and minimum VA in the long-term use group was significantly lower compared to the short-term use group (P<0.05). Number of blinks in the long-term use group was more than that in the short-term use group (P<0.05), although no significant differences were found in VMR, maximum VA, response time, lens deposit and scratch scores, and MRD. The FVA and response time were significantly correlated with MRD (r=0.248, P<0.05) and wearing period (r=0.266, P<0.05), respectively.
Long-term RGP lens use could reduce visual function and increase number of blinks. Instability of visual function with RGP lens use could be related to wearing period and eyelid ptosis.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.
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