Special lens and glasses equipped with the same
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United States of America Patent
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Apr 4, 1989
Grant Date -
N/A
app pub date -
Jun 19, 1986
filing date -
Jan 4, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The effect of the glasses of this invention is estimated and is summarized as follows: (1) The effect of reducing the consciousness of eye fatigue is seen. (2) There is a tendency that the mental subjective symptoms are reduced. (3) Because the sense of fatigue is reduced, concentration becomes easier and it is presumed that it is helpful in preventing irritation and weariness. Since fatigue differs depending on the length of working time, it seems to be necessary to take into consideration the effect due to other fatigue than eye fatigue and the effect of motivation. It seems also necessary to investigate under different conditions the latent fatigue which has not been covered in this report.
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