His eyes are narrowed, perhaps squinting in the sunlight or an indication of intense thinking. Squinting or frequent rubbing of the eyes is also common with exotropia. Squinting is the action of looking at something with partially closed eyes. Squinting and uncontrollable eye movements may be initial signs and symptoms. It is a common belief that squinting worsens eyesight. I looked up and saw Cook squinting at me through the service-hatch. That's like saying shouldn't I try a year of squinting before I try eyeglasses. Squinting can achieve the same effect as a pinhole occluder. The squinting bush brown has been known to participate in the phenomena of mud puddling. Squinting bush browns are one of the first instances of insects severely affected by inbreeding. Squinting bush browns are normally woodland butterflies. Male courtship rates of the squinting bush brown butterfly exhibit a degree of plasticity. An ointment made from the brain of a turtle was the treatment for squinting. The squinting bush brown is of the genus "Bicyclus" and the family Nymphalidae. The squinting bush brown is an ideal butterfly for conducting research.