A device for determining the degree of eye fatigue. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Medicine
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The device for determining the degree of eye fatigue allows you to assess the degree of eye fatigue by the critical flicker fusion frequency (CFFM) and the stability of clear vision (UYaV).
The device is a symmetrical multivibrator, to which a light bulb H1 is connected through a transistor V2. The flickering frequency of the light bulb is set by resistor R05, which has a scale calibrated according to the degree of eye fatigue. The device has two scoreboard attachments: the first is a clear white field for determining the CFFF, the second is a brightly illuminated small object on a dark glass background (for example, a 0,2 mm ring with a gap of 0,3-XNUMX mm). The time after which the subject ceases to distinguish a gap in the ring is a relative indicator of fatigue.
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