PROBLEM TO BE SOLVED: To provide a device, a method, and a program for accurately measuring layer thickness.SOLUTION: An image analysis apparatus 10 includes: tomographic image capturing means for capturing a tomographic image of the retina of an eye to be tested； and output means for outputting layer thickness at a prescribed point in a measurement direction determined to be outputted, between a first measurement direction and a second measurement direction different from the first measurement direction, on the basis of comparison between layer thickness in the first measurement direction and layer thickness to be compared at the prescribed point at a layer boundary included in the tomographic image.SELECTED DRAWING: Figure 1【課題】正確に層厚を計測する装置、方法、プログラムを提供する。【解決手段】画像解析装置１０であって、被検眼の網膜の断層像を取得する断層像取得手段と、前記断層像に含まれる層境界の所定の点における第１の計測方向の層厚と比較対象となる層厚との比較に基づいて前記第１の計測方向および前記第１の計測方向とは異なる第２の計測方向のうち出力すべきと判定された計測方向の前記所定の点における層厚を出力する出力手段とを備える。【選択図】図１
