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document
Effect of sport-tinted contact lenses for contrast enhancement on retinal straylight measurements . PURPOSE To investigate the effect of two tinted contact lenses ( CL ) designed for outdoor sports activity on the psychometric determination of retinal straylight using the compensation comparison method . METHODS Thirteen emmetropic subjects were randomly fitted with two different tinted Nike Maxsight ( Bausch & Lomb , Rochester , NY , USA ) CL in one eye , while the contralateral eye was fitted with a clear lens made of the same material ( Optima 38 , Bausch & Lomb ) . Three valid straylight measurements were taken on each eye before and a few minutes after lens insertion , when lens stabilization had occurred . RESULTS The subjects ' mean straylight values were 0.90 +/- 0.09 at baseline and 0.95 +/- 0.10 with the clear Optima 38 CL . Straylight values were 0.97 +/- 0.10 and 1.0 +/- 0.10 log units with the amber and grey-green tinted CL , respectively . Differences in straylight between baseline ( without CL ) and with the clear CL in place were neither statistically significant ( p = 0.066 ) nor was there a significant difference between baseline and the amber CL ( p = 0.052 ) . However , the grey-green CL showed a statistically significant difference from baseline ( p = 0.006 ) . Differences in straylight with the clear CL compared with the grey-green CL were also statistically different from zero ( p = 0.002 ) showing an increased straylight value for the tinted CL . These differences were variable , but consistent for each subject , thus those showing higher or lower changes with one tinted lens tended to show the same trend with the second lens ( r ( 2 ) = 0.736 ) . CONCLUSIONS Despite increases having been found in straylight values with tinted contact lenses , those changes are not likely to induce clinically significant changes in visual function under photopic conditions , even for the grey-green CL , which seems to increase straylight values more significantly than the amber CL . This difference between the tinted CL could suggest a wavelength dependence of straylight values , although this should be investigated further by controlling for pupil size and subjects ' pigmentation , as well as by using neutral density filters .
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Intervention_Physical
sport-tinted contact lenses
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Intervention_Physical
tinted contact lenses ( CL )
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Intervention_Physical
two different tinted Nike Maxsight ( Bausch & Lomb , Rochester , NY , USA ) CL in one eye
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Intervention_Control
contralateral eye was fitted with a clear lens made of the same material
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Outcome_Other
straylight measurements
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Outcome_Physical
mean straylight values
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Outcome_Other
Straylight values
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Outcome_Physical
straylight value
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Participant_Sample-size
Thirteen
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Participant_Condition
emmetropic