Optotype presenting apparatus

Details Optotype presenting apparatus Optotype presenting apparatus

2008-01-31

2009-06-23

Choi, William C (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

C351S237000, C351S242000

Reexamination Certificate

active

07549751

ABSTRACT:
An optotype presenting apparatus which presents an optotype for visual acuity test, the apparatus comprises: a display that is illuminated by a backlight and includes a light intensity changing device which changes backlight intensity; a background luminance selecting device which selects background luminance of the optotype among a plurality of preset levels, in which background luminance at each level corresponds to standard light intensity changing data in a changeable range determined by the light intensity changing device; and a correction device which corrects the standard light intensity changing data in the background luminance selecting device, the correction device including: an input device which inputs the background luminance measured by an illuminance meter, the measured background luminance being background luminance obtained when the light intensity changing device is operated based on the preset light intensity changing data; and a calculation device which determines correction light intensity changing data by comparing the background luminance input by the input device and the preset light intensity changing data.

REFERENCES:
patent: 5078486 (1992-01-01), Evans
patent: 5568209 (1996-10-01), Priester et al.
patent: 5880814 (1999-03-01), McKnight et al.
patent: 5929972 (1999-07-01), Hutchinson
patent: 6425665 (2002-07-01), Hayashi et al.
patent: A-2006-042978 (2006-02-01), None
patent: WO 02/076301 (2002-10-01), None

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