Human eye visual field testing device

Details Human eye visual field testing device Human eye visual field testing device

1997-06-19

1999-02-09

Dang, Hung Xuan

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351224, 351226, A61B 302

Patent

active

058701699

ABSTRACT:
A device for examining the visual field of the human eye which includes a cup-shaped screen, onto the base of which one or several test marks are projected, and usable for both kinetic and also static perimetry testing and offers test marks of a uniform size and brightness over the entire testing area. The screen consists for this purpose of a transparent material, whereby the test marks are projected from the back side onto the screen approximately parallel to the surface normal. The test mark is thereby arranged to move parallel and relative to the back side of the screen, so that each test mark is moved at an equidistant spacing from the screen.

REFERENCES:
patent: 2803990 (1957-08-01), MacKnight
patent: 2837964 (1958-06-01), Gambs
patent: 3947099 (1976-03-01), Grolman et al.
patent: 4063807 (1977-12-01), Gelius et al.
patent: 4561738 (1985-12-01), Humphrey et al.

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