US 7,320,518 B2
Ophthalmic apparatus
Tetsuyuki Miwa, Nukata-gun (Japan)
Assigned to Nidek Co., Ltd., Gamagori (Japan)
Filed on Jan. 21, 2005, as Appl. No. 11/38,527.
Claims priority of application No. 2004-019078 (JP), filed on Jan. 27, 2004.
Prior Publication US 2005/0162611 A1, Jul. 28, 2005
Int. Cl. A61B 3/10 (2006.01); A61B 3/00 (2006.01)
U.S. Cl. 351—206  [351/200] 5 Claims
OG exemplary drawing
 
1. An ophthalmic apparatus comprising:
an illuminating optical system which projects light to an examinee's eye;
an image pickup unit which color-photographs an interference image caused by interference of light reflected by a tear layer of the eye; and
an analyzing part which dissolves the photographed interference image to a plurality of color components, determines an appearance of interference stripes of each color component based on changes in signal level of each color component on an analysis line within an analysis area of the interference image, and obtains a value indicating a dry eye symptom based on a sum or an average value of at least one of the number of the interference stripes of each color component and the changes in the signal level of each color component on the analysis line.