Focus control system

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1989-06-09

1990-11-27

Gellner, Michael L.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

354 62, 354210, 351210, G03B 310, G03B 2900

Patent

active

049740105

ABSTRACT:
A system for focussing a lens on a point light source is provided that includes an opaque member disposed near the lens. The member cast a shadow having a distinguishable orientation in the image of the light source. An image processing device determines the focus condition and range to the point light source from the orientation and size of the shadow.

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