An ophthalmologic apparatus comprising: an optical measurement system adapted to radiate measurement light to an eye to be examined, a drive unit adapted to move the optical measurement system relative to the eye, an imaging unit adapted to take a cross sectional image of the eye by using reflected light of the measurement light from the eye, and a controller adapted to control the drive unit and the imaging unit, such that when the drive unit positions the optical measurement system relative to the eye, the controller obtains a two-dimensional cross sectional image by the imaging unit, one axis of the two-dimensional cross sectional image extending in a vertical direction (y) of the eye, and another axis of the two-dimensional cross sectional image extending in a depth direction (z) of the eye, and the controller is further adapted to determine whether the eye is in an examinable state or not based on the two-dimensional cross sectional image, further comprising: a detecting unit adapted to detect a position of a corneal top of the eye, wherein the drive unit (34, 35) is further adapted to position the optical measurement system such that the position of the corneal top detected by the detecting unit is positioned at a reference position preset relative to the two-dimensional cross sectional image to be obtained by the imaging unit, and the controller is further adapted to determine whether the eye is in the examinable state or not based on a specific area (46a, 46b) preset in the two-dimensional cross sectional image, the specific area (46a, 46b) having a predetermined range in the vertical direction and is a predetermined distance away from the reference position in the vertical direction. an optical measurement system adapted to radiate measurement light to an eye to be examined, a drive unit adapted to move the optical measurement system relative to the eye, an imaging unit adapted to take a cross sectional image of the eye by using reflected light of the measurement light from the eye, and a controller adapted to control the drive unit and the imaging unit, such that when the drive unit positions the optical measurement system relative to the eye, the controller obtains a two-dimensional cross sectional image by the imaging unit, one axis of the two-dimensional cross sectional image extending in a vertical direction (y) of the eye, and another axis of the two-dimensional cross sectional image extending in a depth direction (z) of the eye, and the controller is further adapted to determine whether the eye is in an examinable state or not based on the two-dimensional cross sectional image, further comprising: a detecting unit adapted to detect a position of a corneal top of the eye, wherein the drive unit (34, 35) is further adapted to position the optical measurement system such that the position of the corneal top detected by the detecting unit is positioned at a reference position preset relative to the two-dimensional cross sectional image to be obtained by the imaging unit, and the controller is further adapted to determine whether the eye is in the examinable state or not based on a specific area (46a, 46b) preset in the two-dimensional cross sectional image, the specific area (46a, 46b) having a predetermined range in the vertical direction and is a predetermined distance away from the reference position in the vertical direction.