PROBLEM TO BE SOLVED: To provide an ophthalmologic apparatus capable of determining whether information obtained from tomographic images is caused by an individual difference or a disease.SOLUTION: The apparatus comprises: acquisition means 220 for acquiring the fundus tomographic images of a subject eye and comparison means for comparing the layer thicknesses of a fundus oculi at positions symmetrical with respect to a straight line combining the center of a macula with the center of discus nervi optici in the fundus oculi.SELECTED DRAWING: Figure 1