Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1997-03-28
2000-06-13
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351224, A61B 302
Patent
active
060740647
ABSTRACT:
An apparatus for measuring the limits of a visual peripheral field includes a gaze-fixing mirror containing a dot for fixing the gaze of an examinee, a backing to which the mirror is fastened, and a base to which the backing is joined. The base forms a storage space for a measuring tool and at least one target object. The mirror, the backing and the base are collapsible and easily transportable by a single hand. The system replaces widely-known finger perimetry methods now in general use and positions the examiner behind the examinee. The examiner monitors the examinee's gaze with the help of the mirror while introducing target objects into the visual field of the examinee. The examinee indicates awareness of the target objects so that the limits of the examinee's visual peripheral field can be noted and recorded.
REFERENCES:
patent: 3737217 (1973-06-01), Haines et al.
patent: 4346968 (1982-08-01), Melin et al.
patent: 5302981 (1994-04-01), Wirtz
Lyman C. Norden, O.D., "Reliability in perimetry," Journal of the American Optometric Association, Dec. 1989, pp. 880-890.
Harley, "Ophthalmic Examinations of Infants and Children", Pediatric Ophthalmology, Second Edition, 1983, p. 127.
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