Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – With antiglare or shading
Patent
1998-10-06
2000-05-02
Mai, Huy
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
With antiglare or shading
351 45, 351 49, 351158, G02C 710
Patent
active
060563974
ABSTRACT:
A method and apparatus for reducing glare created by oncoming headlights or the sun at either dusk or dawn is disclosed. The method uses a light filter to reduce the intensity of light encountered by a driver from oncoming headlights in a region. The region is defined by the driver's side portion of the windshield and a separatrix. The separatrix includes a horizontal segment, a vertical segment, and a perspective segment. The horizontal segment is located between the driver's side portion and the passenger's side portion of the perimeter of the windshield. The horizontal segment has first and second ends such that the second end is adjacent to the driver's side portion and the first end is adjacent to the passenger's side portion. The vertical segment begins at a central position on the upper portion of the windshield and ends at the first end of the horizontal segment. The perspective segment begins at the second end of the horizontal segment and extends downward at an obtuse angle towards the driver's side portion of the windshield ending at the lower portion of the windshield. The perspective segment accounts for the approach pattern of automobiles and terminates at the horizontal segment which is preferably substantially parallel with the horizon. The light filter uses either tinted elements, polarized elements, or a combination of both tinted and polarized elements for reducing the intensity of the light. Various embodiments of the apparatus disclosed herein include eyeglasses, clip-on eyeware, windshields, visors, and a combination of either eyeglasses or clip-on eyeware to be combined with either a windshield or visor.
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Author: John V. Forrester, et al; Title: "The Eye" pp. 199, 202-207, 220-223, and 236; Date of Publication: 1996: Place of Publication: United States.
Mai Huy
The Research Foundation of State University of New York
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