Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1996-09-16
1998-05-19
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351218, 351246, A61B 302, A61B 310
Patent
active
057542740
ABSTRACT:
A field of view collimator for self-monitoring peripheral vision loss. The field of view collimator includes a hand-held housing having a viewing aperture for placement adjacent to the subject's eye. A lens projects an image to the eye. The image, in the form of a circular edge, is formed by an iris diaphragm positioned behind the lens. The angular size of the image is adjustable by opening or closing the iris diaphragm. A diffuser is positioned behind the iris diaphragm to provide an even back-illumination. Indicia markings indicate the measured field of view. The device is particularly suitable for home use by persons with glaucoma.
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Edmund Scientific, Off-the-Shelf Optics & Components for OEM and Research Applications, #14N7.
Seiler Instrument, Dioptometer, PN 7680631.
Mai Huy
Wound Healing of Oklahoma
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