Measuring device of the reflected light intensity ratio of the cornea

摘要

PROBLEM TO BE SOLVED: To provide an apparatus for measuring the reflected luminous energy ratio of the cornea, which is capable of effectively separating reflected light from layers other than one to be measured and accurately measuring a correct reflected luminous energy ratio of the cornea for a narrow specific position of the cornea of an eye to be examined. SOLUTION: The apparatus for measuring the reflected luminous energy ratio of the cornea has a slit plate 6 that can rotate around the center of the circumference and stop in which a first slit and a second slit are formed on the same circumference, an illuminating optical system 4 having the first slit and an illuminating light source 7 and intended for illuminating the front of an eye E to be examined from the side by slit illumination light passing through the first slit, a luminous energy measuring optical system 3 having the second slit and a photoelectric device 28 receiving slit illuminating light reflected from the front and measuring its luminous energy through the stationary second slit, a focusing mechanism 22 arranged in the measuring optical system 3 and moving the focal position of the measuring optical system to the optical axis.