As distinguished from measuring the ability to see at the location where the eye's gaze is fixated, perimetry consists of determining the visual capabilities throughout the field of vision. Traditionally the ability to see a white object or a projected spot of white light is determined and quantified under standard conditions. Modern machines use automated methods to present spots of light in a programmed manner to determine the threshold of visual capability, and, after recording the data, these machines also apply statistical analyses of the results to assist the clinician in evaluation of the patient. New methods for testing particular aspects of visual function and analyzing the results are continuously under development.
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