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KMID : 1159320170190030293
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Korean Journal of Vision Science
2017 Volume.19 No. 3 p.293 ~ p.302
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Comparison of Visual Quality and Subjective Ocular Symptoms with Comfilcon A Silicone Hydrogel Contact Lens Wearing Times
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Kim Jeong-Mee
Lee Koon-Ja
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Abstract
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Purpose: To compare the visual quality and subjective ocular symptoms with Comfilcon A silicone hydrogel contact lens wearing times.
Methods: Twenty seven subjects (24.30 ± 2.96 years, 14 females, 13 males) took part in this study. Subjects were fitted with silicone hydrogel contact lenses providing best-corrected visual acuity. Best-corrected visual acuity (VA) at two contrast levels (100% and 10%) and best-corrected contrast sensitivity (CS) for four spatial frequencies (3, 6, 12 and 18 cycles/degree) were measured under photopic and mesopic conditions. Corneal higher-order aberrations (HOAs) were measured with 4-mm and 6-mm pupils using Wavefront Analyzer. Subjects were asked to complete the questionnaire for subjective ocular symptoms related contact lens. All measurements and questionnaires were performed after wearing silicone hydrogel lenses for 2 hours and 9 hours in a day.
Results: Regarding visual quality under photopic and mesopic conditions, there was no statistically significant difference between 2 hours and 9 hours wear in high contrast, low contrast VA and CS. We also did not find out any significant changes in corneal HOAs, including third-order, fourth-order, coma, and spherical aberration for both 4-mm and 6-mm pupils between the two wearing times. Among the relative frequency items of subjective ocular symptoms related contact lens, there were statistically differences between 2 hours and 9 hours wear in discomfort, dryness, and closing eyes (p=0.031, p=0.001, and p=0.031, respectively).
Conclusion: It can be identified that Comfilcon A silicone hydrogel contact lenses showed no change in the optical quality and visual quality of the eye for more than 9 hours wear. However, uncomfortable ocular symptoms and dryness increased as much as wearing time of the silicone hydrogel contact lens was longer. Thus, guidance of contact lens care to reduce those symptoms is considered necessary.
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KEYWORD
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Silicone hydrogel contact lenses , Visual quality , Subjective ocular symptoms
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