Title:
視標呈示装置
Document Type and Number:
Japanese Patent JP5079575
Kind Code:
B2
Abstract:
An optotype presenting apparatus capable of presenting an optotype having a high degree of flexibility to an examinee's eye while a production cost of the apparatus is curbed comprises a main body comprising an optotype forming unit comprising first and second displays displaying optotypes, and a beam combiner combining optical paths of the displays, the optotype forming unit adjusting, if optotype light bundles have polarizing axes, the axes, and providing, if optotype light bundles have no polarizing axis, polarizing axes to the bundles, whereby the bundles form optotypes having the perpendicular polarizing axes, and a projection optical system for projecting the light bundles onto the eye at a test distance, an optotype selecting unit, and a display control unit controlling the displays to display binocular-vision-test optotypes if they are selected, and controlling one of the displays to display a visual-acuity-test optotype if it is selected.
Inventors:
Takeshi Oda
Application Number:
JP2008094359A
Publication Date:
November 21, 2012
Filing Date:
March 31, 2008
Export Citation:
Assignee:
NIDEK CORPORATION
International Classes:
A61B3/028; A61B3/08
Domestic Patent References:
| JP5130975A | ||||
| JP9098949A | ||||
| JP2007296100A | ||||
| JP7203488A | ||||
| JP6008953U | ||||
| JP2008521064A | ||||
| JP2009060941A |