1. An ophthalmologic apparatus for measuring the state of a lacrimal layer formed on a cornea surface of an eye to be examined, comprising: an optical projection system for projecting light of a ring-shaped pattern onto the cornea surface; an imaging device for photographing a ring-shaped pattern reflection image of the projected light from the cornea surface; and an operating unit for calculating the degree of distortion of the ring-shaped pattern reflection image on the basis of the density value distribution of the image photographed by the imaging device without calculating a cornea shape, wherein the operating unit further determines based only upon the calculated degree of distortion of the ring-shaped pattern reflection image whether the lacrimal layer reaches a state of dryness or not.