Invention Grant
- Patent Title: Optotype presenting apparatus
- Patent Title (中): 光面呈现装置
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Application No.: US12232797Application Date: 2008-09-24
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Publication No.: US08087781B2Publication Date: 2012-01-03
- Inventor: Yuichiro Kanazawa , Tatefumi Oda
- Applicant: Yuichiro Kanazawa , Tatefumi Oda
- Applicant Address: JP Gamagori-shi
- Assignee: Nidek Co., Ltd.
- Current Assignee: Nidek Co., Ltd.
- Current Assignee Address: JP Gamagori-shi
- Agency: Oliff & Berridge, PLC
- Priority: JP2007-258167 20071001
- Main IPC: A61B3/02
- IPC: A61B3/02

Abstract:
An optotype presenting apparatus, by which red and green optotypes can be visually perceived independently by right and left eyes even if red filters and/or green filters have different wavelength transmission characteristics, comprises a color display, a unit having a switch for selecting a test chart including visual acuity and red-green binocular visual performance test charts, wherein the binocular test chart includes the optotypes and is used in the test performed with the filters in front of the eyes, a memory storing color adjustment data in which at least one of color tones of the optotypes is varied with the characteristic of one of the filters, a unit for inputting a signal for selecting one of the data, and a unit controlling the display to display the selected chart and adjusting the tones by reading the selected data from the memory when the binocular test chart is selected.
Public/Granted literature
- US20090086166A1 Optotype presenting apparatus Public/Granted day:2009-04-02
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