Method and system to measure the lachrymal fluid

摘要

A CCD camera (7) captures an image of the lachrymal fluid layer in a prescribed position of a subject's eye (E) to which a target substance (124, 125) is administered. Images (t2, t5) are selected from a plurality of images captured, and the positions of the target substance (124, 125) in the selected images (t2, t5) and the capturing times thereof are used to compute the movement speed of the target substance. The computed movement speed of the target substance (124, 125) is then outputted as the movement speed of the lachrymal fluid of the subject's eye (E). This arrangement allows the movement speed of lachrymal fluid to be reliably measured, assuring quantitative diagnosis even of severe dry eye.