Apparatus for testing dark adaptation

Details Apparatus for testing dark adaptation Apparatus for testing dark adaptation

A - Human Necessities

61

B

88/121.5

A61B 3/06 (2006.01)

Patent

CA 2010258

A B S T R A C T "Apparatus for testing dark adaptation" Apparatus (1) for testing dark adaptation comprises a test panel (8). Four test stimuli (11), comprising arrays of light emitting diodes (14), are arranged on the test panel (9) around a fixation light emitting diode (12). Translucent covers (17) are mounted over the arrays of light emitting diodes (14). Four switches (18) to enable a subject to input the identity of a visible test stimulus (11) are provided, each switch (18) is operated by a button formed by a respective cover (17) of the test stimuli (11). A test stimulus (11) is randomly selected and switched on at a predetermined level of luminance. On a correct identification, another test stimulus (11) is selected and switched on at a reduced level of luminance. The times from the commencement of the test until the various correct identifications are recorded, as are the corresponding level of luminance of the test stimuli (11).

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