Visual axis and alignment measurement system and method of...

Details Visual axis and alignment measurement system and method of... Visual axis and alignment measurement system and method of...

2007-02-19

2009-12-08

Schwartz, Jordan M. (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S204000, C351S214000

Reexamination Certificate

active

07628489

ABSTRACT:
A visual axis and alignment measurement system and method of using same are disclosed. In particular, a visual axis measurement system of the present disclosure includes a visual axis measurement device and a near point target. The visual axis measurement device includes a pair of opaque lenses, each having a slit therein, that are adjustably coupled via a coupling mechanism. The visual axis measurement device also includes a linear measurement device. Via self-adjustment, the patient may align the respective slits for his/her dominant and non-dominant eyes along his/her visual axes until the near point target is in focus. After which, the distance between the centers of the slits is measured in order to determine accurately the placement of bifocal lens segments within eyeglass lenses. In doing so, it is ensured that the prescription for, for example, progressive bifocal corrective lenses, which have narrow viewing areas, is correct.

REFERENCES:
patent: 4252419 (1981-02-01), Padula et al.
patent: 4381143 (1983-04-01), Bommarito
patent: 4531297 (1985-07-01), Stoerr
patent: 5237351 (1993-08-01), Kohayakawa et al.

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