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Effect of the pigment-free optical zone diameter of decorative tinted soft contact lenses on visual function

 Ji Won Jung  ;  Sang Myung Kim  ;  Sun Hyup Han  ;  Eung Kweon Kim  ;  Kyoung Yul Seo  ;  Tae-im Kim 
 British Journal of Ophthalmology, Vol.100(7) : 633-637, 2016 
Journal Title
 British Journal of Ophthalmology 
Issue Date
Adult ; Astigmatism/physiopathology ; Contact Lenses, Hydrophilic* ; Contrast Sensitivity/physiology* ; Corneal Wavefront Aberration/physiopathology ; Cosmetic Techniques/instrumentation* ; Female ; Healthy Volunteers ; Humans ; Male ; Prospective Studies ; Pupil/physiology ; Visual Acuity/physiology* ; Young Adult
Contact lens
AIMS: We investigated changes in visual function after wearing decorative tinted soft contact lenses with different pigment-free optical zone diameters. METHODS: A prospective study was performed in 30 eyes of 30 healthy volunteers. Best-corrected visual acuity (BCVA), ocular higher-order aberrations (HOAs), modulation transfer function (MTF), Strehl ratio and contrast sensitivity were evaluated after wearing clear lens and tinted lenses with different pigment-free optical zone diameters (4, 5 and 6?mm). RESULTS: BCVA decreased from 0.00 logMAR after wearing a clear lens to 0.04±0.04 logMAR after wearing 4?mm optical zone lens (p<0.001). As the optical zone diameter decreased, ocular aberrations were induced. Total HOAs, coma aberration and secondary astigmatism showed significant difference between clear lens and 5 or 4?mm optical zone lenses (p<0.050). Spherical aberration and trefoil showed significant difference between clear lens and 4?mm optical zone lens (p<0.050). The results for Strehl ratio revealed poorer optical quality for both 5 and 4?mm optical zone lens (both p=0.002). The entire ocular MTF was significantly different, corresponding to the decreased optical zone diameter. The HOAs showed a correlation with the blocked pupil covered by the tinted part (r=0.435, p<0.001). In photopic and mesopic conditions, the contrast sensitivity decreased significantly with the reduced pigment-free optical zone diameters. CONCLUSION: Decorative tinted contact lenses significantly increased ocular aberrations and decreased optical quality and contrast sensitivity, as the pigment-free optical zone diameter decreased. Therefore, consumers of tinted lenses should be informed about the possible disturbance in visual function. TRIAL REGISTRATION NUMBER: NCT02537275.
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1. College of Medicine (의과대학) > Dept. of Ophthalmology (안과학교실) > 1. Journal Papers
Yonsei Authors
김응권(Kim, Eung Kweon) ORCID logo https://orcid.org/0000-0002-1453-8042
김태임(Kim, Tae Im) ORCID logo https://orcid.org/0000-0001-6414-3842
서경률(Seo, Kyuong Yul) ORCID logo https://orcid.org/0000-0002-9855-1980
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