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KMID : 1011420130180010019
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Journal of Korean Ophthalmic Optics Society
2013 Volume.18 No. 1 p.19 ~ p.25
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Changes in the Covering of Pupil and the Visual Acuity by the Illuminance when Wearing Circle Soft Contact Lens
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Kim So-Ra
Choi Jae-Hyung
Lee Kang-Geun
Park Mi-Jung
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Abstract
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Purpose: The degree of the pupil covered with tinted region of circle soft contact lens was determined according to the illuminant conditions in everyday life and the change of visual acuity by its covering was further investigated. Methods: The circle contact lens having the non-tinted area of 6.2 mm in the center of the lens was applied on 82 eyes in their 20s and their minimum separable visual acuity and minimum legible visual acuity were determined under the luminances of 50 and 370 lux. Results: The covering of pupil was not found when wearing circle contact lens under 370 lux, however, some pupil covering ranged from 0.40 to 1.70 mm was observed in all subjects under 50 lux. The minimum separable visual acuity and minimum legible visual acuity were significantly decreased by the wearing of circle contact lens under 50 lux and the correlation between the larger pupil size of subjects and more decrease of visual acuity was observed. Furthermore, the decrease of minimum separable visual acuity was larger than the case of minimum legible visual acuity indicating that minimum separable visual acuity was largely affected by the covering of pupil. Conclusions: The consideration is necessary for the lens wearers and the manufacturers since the wearing circle contact lens in low-light indoor or nighttime activities may affect directly visual acuity.
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KEYWORD
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Circle contact lens, Light intensity, Covering of pupil, Minimum separable visual acuity, Minimum legible visual acuity
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