Geometrical instruments – Scriber – Curved line
Patent
1990-01-19
1991-08-06
Haroian, Harry N.
Geometrical instruments
Scriber
Curved line
33507, G01B 100, B43L 1300
Patent
active
050365924
ABSTRACT:
An apparatus and method for subjectively determining the proper positioning of progressive power or other corrective lenses are disclosed. The apparatus includes a target such as a small fiber optic or other light source and one or more marking rods which may be activated by the patient. While wearing prefitted frames and fixating on a remote target, the patient places the light source against or immediately adjacent the exterior surface of the simulated or other lens within either of the frames and positions the light so that it is centered in his or her line or sight. Once the light is centered the patient activates the marking rod which contacts, and marks, the exterior surface of the lens. Because the light source and marking rod or rods are designed to obstruct very little of the patient's vision, his or her peripheral vision remains intact during the process, thereby allowing binocular fusion to occur and avoiding introduction of phoria errors into the positioning process.
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Page 29 of the U.S. Optical Spring '90 catalog.
pp. 79-80 of the Western Optical Ophthalmic Instrument Catalog 1989/1990.
Chapter 28 of Borish, Clinical Refraction (3d ed. 1970), "Bifocals, Multifocals, and Progressive Addition Lenses".
Borish, Hitzeman, and Brookman, "Double Masked Study of Progressive Addition Lenses", Journal of the American Optometric Association 933-43 (vol. 10, No. 51, 1980).
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A "Multi-Purpose Measuring Device", of the Varilux Corporation.
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An Advertisement Entitled, "Trust Their Promises or Believe Your Own Eyes", for Sola Optical USA, Inc. (.COPYRGT.1988).
An Advertisement Entitled, "You Dream. We Deliver.", for American Optical.
Three Photographs of the Grolman Fitting System.
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