Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Norihiko Yokoi0
Takayoshi Suzuki0
Date of Patent
October 9, 2007
0Patent Application Number
092732860
Date Filed
March 19, 1999
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A grid formed with apertures of a predetermined shape is illuminated with light from a lamp and projected onto a tear meniscus accumulated on the lower eyelid. The aperture image projected on the tear film is imaged by a CCD camera. The tear meniscus functions as a concave mirror, so that the magnification factor depends on the radius of meniscus curvature. A processor calculates the magnitude of the grid image and evaluates the radius of meniscus curvature. Since the volume of lacrimal fluid varies depending upon the radius of meniscus curvature, the latter is used as a value representing the lacrimal fluid volume for dry eye diagnose purposes.
Timeline
No Timeline data yet.
Further Resources
No Further Resources data yet.
