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专利权人:
株式会社ニデック
发明人:
金澤 雄一郎,鈴木 陵司
申请号:
JP2007045564
公开号:
JP5085957B2
申请日:
2007.02.26
申请国别(地区):
JP
年份:
2012
代理人:
摘要:
An optotype presenting apparatus (1) which presents an optotype for visual acuity test, the apparatus comprising: a display (3) that is illuminated by a backlight (3b) and includes a light intensity changing means (20) for changing backlight intensity is characterized in that a background luminance selecting means (20) for selecting background luminance of the optotype among a plurality of preset levels (L1 to L5), in which background luminance at each level corresponds to standard light intensity changing data in a changeable range determined by the light intensity changing means and a correction means (20) for correcting the standard light intensity changing data in the background luminance selecting means, the correction means including: an input means (7) for inputting the background luminance measured by an illuminance meter, the measured background luminance being background luminance obtained when the light intensity changing means is operated based on the preset light intensity changing data and a calculation means (20) for determining correction light intensity changing data by comparing the background luminance input by the input means and the preset light intensity changing data.
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