You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Outcome", "Participant", "Intervention"].

Please return the output as a JSON object of the format: {"Participant" : ["patients with COPD", ...], "Intervention" : ["Atenolol", ...], "Outcome" : ["blood pressure", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

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 .
{"Intervention": ["tinted contact lenses ( CL )", "two different tinted Nike Maxsight ( Bausch \u0026 Lomb , Rochester , NY , USA ) CL in one eye", "sport-tinted contact lenses", "contralateral eye was fitted with a clear lens made of the same material"], "Outcome": ["straylight measurements", "straylight value", "mean straylight values", "Straylight values"], "Participant": ["Thirteen", "emmetropic"]}