Method and vision testing apparatus for determining the necessity of a vision aid during darkness and/or twilight as well as a set of vision aids
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United States of America Patent
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app pub date -
Jul 12, 2006
filing date -
Jan 24, 2004
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Abstract
A method and a vision test apparatus determine the necessity of a vision aid during darkness and/or twilight. Also, a set of vision aids are referred to. The daylight defective vision is measured at at least one value of high luminance=10 cd/m.sup.2 and the night defective vision is measured at at least one value of low luminance <10 cd/m.sup.2. Thereafter, the difference between the daylight defective vision and the night defective vision is determined and, when a defined value is exceeded, the recommendation for using a vision aid during darkness and/or twilight is outputted.
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