Vision science is the science dedicated to the interdisciplinary study of visual perception and the visual system. Vision scientists study various aspects of vision from the perspectives of cognitive psychology, neuroscience, computer science, psychophysics, and optometry.

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Evaluation of the visual fields should never be omitted from the basic eye examination. Testing the visual fields consists of confrontation field testing in which each eye is tested separately to assess the extent of the peripheral field. To perform the test, the individual occludes one eye while fixated on the examiner's eye with the non-occluded eye. The patient is then asked to count the number of fingers that are briefly flashed in each of the four quadrants. This method is preferred to the wiggly finger test that was historically used because it represents a rapid and efficient way of answering the same question: is the peripheral visual field affected?

Common problems of the visual field include scotoma (area of reduced vision), hemianopia (half of visual field lost), homonymous quadrantanopia (involving both eyes) and bitemporal hemianopia.

Davis subjected him to numerous tests, and though unable to find any explanation for his strange performances, he made some interesting observations. I said to the latter: "Please make this patient stay at home. In Isabel's case letters were antagonistic. Some men can run for hours without becoming tired. On February 6, the vision of the right eye was normal both for the nearpoint and the distance. A number of these cases of apparent change of focus1 Physiologic Optics, p. She said the glasses tired her eyes and blurred her vision, but that she had persisted in wearing them, in spite of a continual.

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