PROBLEM TO BE SOLVED: To adjust the light quantity of measurement light projected onto a subject eye without directly controlling the emission quantity of a light source.SOLUTION: An optical coherent tomographic apparatus comprises : adjustment means for adjusting the light quantity of light emitted from a light source； first division means for dividing the light routed through the adjustment means into measurement light to be projected onto a subject and reference light； second division means for dividing the light routed through the adjustment means； means for measuring the light quantity of light quantity measuring light obtained by division with the second division means； and control means for controlling the adjustment means such that the light quantity of the light emitted from the light source is adjusted based on the measured light quantity.SELECTED DRAWING: Figure 1【課題】光源の発光量を直接制御せずに、被検眼に照射する測定光の光量を調整すること。【解決手段】光干渉断層撮影装置が、光源から発せられた光の光量を調整する調整手段と、調整手段を介した光を被検査物に照射する測定光と参照光とに分割する第一の分割手段と、調整手段を介した光を分割する第二の分割手段と、第二の分割手段により分割して得た光量測定用の光の光量を測定する手段と、測定された光量に基づいて光源から発せられた光の光量を調整するように調整手段を制御する制御手段と、を有する。【選択図】図１
