04865438 is referenced by 26 patents and cites 3 patents.

Spectacles provided with a magnifier, in which magnifier elements are mounted on a body of spectacles, a distance to an object to be seen is measured, a movable lens encased in the magnifier element is controlled and driven forward or backward along an optical axis on the basis of the result of the measurement to automatically adjust the focal length of the magnifier elements. A user of spectacles can merely peep an object to be seen through the magnifier to always see a magnified image with the focal point adjusted.

Spectacles provided with a magnifier having an automatic focusing function
Application Number
Publication Number
Application Date
December 31, 1987
Publication Date
September 12, 1989
Juro Wada
21-6-602, Nishiikebukuro 5-chome, Toshima-ku, Tokyo
Watson Cole Grindle & Watson
G02B 25/00
G02C 1/00
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