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document
Influence of special-effect contact lenses ( Crazy Lenses ) on visual function . PURPOSE Special-effect contact lenses ( opaque , tinted soft contact lenses that incorporate decorative images such as " cateyes , " stars , or hearts to alter eye color and structure ) have become increasingly popular . The purpose of this study was to investigate whether such lenses impair visual function . METHODS A clear soft contact lens and a special-effect soft contact lens ( Crazy lens , ) were fit in changing sequence in nine healthy subjects . The parameters studied included : visual acuity , contrast sensitivity ( with and without glare ) , visual field , and mesopic vision ( with and without glare ) . RESULTS The following parameters displayed a statistically significant difference ( P < 0.05 ) . Visual acuity was decreased to 0.9 +/- 0.23 in the Crazy lens group as compared with 1.2 +/- 0.13 in the clear lens group . Goldmann visual field displayed a significant constriction of the isopters : III/4 , I/4 , and I/3 . Mesopic vision without glare was reduced from 1:2.5 to 1:7.4 . Contrast sensitivity was significantly reduced in a photopic condition with and without glare and in a scotopic condition without glare . Furthermore , the special-effect lenses were associated with a decrease in lens wearing comfort . CONCLUSIONS Special-effect contact lenses were associated with a reduction of many visual functions , including visual acuity and contrast sensitivity . For some wearers this may interfere with activities where excellent vision is crucial , such as driving a car .
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Intervention_Physical
special-effect contact lenses ( Crazy Lenses )
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Intervention_Physical
Special-effect contact lenses
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Intervention_Physical
A clear soft contact lens
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Intervention_Physical
a special-effect soft contact lens ( Crazy lens , )
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Intervention_Physical
clear lens
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Intervention_Physical
special-effect lenses
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Intervention_Physical
Special-effect contact lenses
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Outcome_Physical
visual function
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Outcome_Physical
visual function
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Outcome_Physical
visual acuity
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Outcome_Physical
contrast sensitivity ( with and without glare )
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Outcome_Physical
visual field
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Outcome_Physical
mesopic vision ( with and without glare )
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Outcome_Physical
Visual acuity
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Outcome_Physical
Goldmann visual field
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Outcome_Physical
constriction of the isopters
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Outcome_Physical
Mesopic vision without glare
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Outcome_Physical
Contrast sensitivity
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Outcome_Physical
lens wearing comfort
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Outcome_Physical
visual functions
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Outcome_Physical
visual acuity
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Outcome_Physical
contrast sensitivity
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Participant_Sample-size
nine
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Participant_Condition
healthy