Ophthalmic measuring apparatus

Details Ophthalmic measuring apparatus Ophthalmic measuring apparatus

1992-07-23

1994-01-18

Ben, Loha

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351206, 351214, A61B 310

Patent

active

052803139

ABSTRACT:
An ophthalmic measuring apparatus for easily determining whether an ametropia of an eye to be tested is caused by an abnormality in the length of the ocular axis or an abnormality in the lens or the cornea of the eye, includes a first light source, a first detector, and an ocular refractivity measuring unit for optically measuring the ocular refractivity of the eye. The apparatus further includes a second light source different from the first light source, the second detector different from the first detector, an ocular-axis-length measuring unit for optically measuring the length of the ocular axis of the eye, and a determination unit for determining the characteristics of the ametropia of the eye from the result of the measurement by the ocular refractivity measuring unit and the result of the measurement by the ocular-axis-length measuring unit.

REFERENCES:
patent: 4372655 (1983-02-01), Matsumura et al.
patent: 4402601 (1983-09-01), Riva
patent: 4609287 (1986-09-01), Kohayakawa
patent: 4697895 (1987-10-01), Sekiguchi et al.
patent: 4755041 (1988-07-01), Ishikawa et al.
patent: 4820037 (1989-04-01), Kohayakawa et al.
patent: 4938584 (1990-07-01), Suematsu et al.

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