Patent ID: 8830483

Claim:
An optical tomographic image forming method comprising: splitting low coherence light emitted from a light source into a measuring light and a reference light; positioning a reference mirror at a predetermined length of optical path away from the splitting position; irradiating said measuring light onto a measured object via a condenser lens; irradiating said reference light onto said reference mirror; superposing a reflected light reflected from said measured object and a reflected light reflected from said reference mirror to detect an interference light; and forming an optical tomographic image of said measured object by the detecting the interference light, wherein the method further comprises: inputting a refractive index of said measured object; correcting said tomographic image in accordance with the inputted refractive index of said measured object; and outputting the corrected tomographic image, wherein the method further comprises: moving at least one of said measured object, said condenser lens, and said reference mirror along an optical path to obtain a first position of said measured object, said condenser lens, and said reference mirror in which the intensity of an interference light of a reflected light reflected from said first reflecting surface and a reflected light from said reference mirror is maximized; moving said measured object or said condenser lens along said optical path, while holding said reference mirror at the first position, to obtain a second position in which the intensity of an interference light of a reflected light reflected from said second reflecting surface and said reflected light from said reference mirror is maximized, moving said reference mirror along said optical path, while holding said measured object or said condenser lens at the first position, to obtain a third position in which the intensity of an interference light of a reflected light reflected from the second reflecting surface and said reflected light from said reference mirror is maximized; and obtaining said refractive index of said measured object based on the first position, second position and the third position.