Patent ID: 8827455
Filing Date: 2014-09-09
Classification: A61B

Abstract:
1. A method for evaluating a contact lens fitting state, the method comprising the steps of: detecting a pupil area and an iris area in an eye; obtaining a dye image showing a location of a dye in the eye by irradiating a visible light which can detect the dye to the eye; converting the dye image to a single color image whose color levels are proportional to amounts of the dye; detecting a boundary, a center and a radius of a contact lens placed on the eye from the single color image; dividing an area of the contact lens into two parts, a central part W and peripheral parts W calculating a dying degree Ck of the central part W and comparing the calculated dying degree Ck with a predetermined range to evaluate the contact lens fitting state, wherein the single color image is formed by calculating a standardized color level g(x, y) which corresponds to a distance between two vectors u and v, wherein the most intrinsic color of the dye is defined by a vector u, and a color of a pixel at position (x, y) in the dye image is defined by a vector v, and wherein the dying degree Ck is a ratio of an area of pixels Wg having color levels that are higher than a predetermined value in the central part W with respect to the area of the central part W in the single color image.