Optical instrument and viewing method

Details Optical instrument and viewing method Optical instrument and viewing method

1976-05-24

1977-11-22

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

D 2234, 33262, 351 45, G02B 500

Patent

active

040593479

ABSTRACT:
A see-through zone is provided of a shape and size so that the horizontal end portions of the zone will merge as an image defining a target frame into which the user can center a stationary or moving target by keeping his line of sight properly on the target.

REFERENCES:
patent: D132297 (1942-05-01), Hubert
patent: D157083 (1950-01-01), Paulson
patent: D175469 (1958-08-01), Ives
patent: 1568900 (1926-01-01), Metcalf
patent: 1676760 (1928-07-01), Wilson
patent: 1752889 (1929-04-01), Cornwell et al.
patent: 1882909 (1932-10-01), Rhue
patent: 2409356 (1944-10-01), Hutchings
patent: 2511776 (1960-06-01), Kelly
patent: 3689136 (1972-09-01), Altamian

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