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:

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 .
{"Intervention": ["special-effect contact lenses ( Crazy Lenses )", "a special-effect soft contact lens ( Crazy lens , )", "Special-effect contact lenses", "clear lens", "A clear soft contact lens", "special-effect lenses"], "Outcome": ["Visual acuity", "constriction of the isopters", "mesopic vision ( with and without glare )", "visual functions", "Goldmann visual field", "visual acuity", "Contrast sensitivity", "lens wearing comfort", "contrast sensitivity ( with and without glare )", "visual field", "Mesopic vision without glare", "visual function", "contrast sensitivity"], "Participant": ["nine", "healthy"]}