| 摘要 |
A method and an apparatus using optical coherence tomography based on spectral interference where depth information of an object can be speedily obtained and an information acquisition range in a depth direction can be enlarged by removing noise, and to provide an ophthalmic apparatus. The method includes the steps of forming object light by projecting light with short coherent length onto the object, forming reference light by projecting light with short coherent length onto a reference surface, synthesizing the object and reference light to be interference light, dispersing the light into predetermined frequency components, and photo-receiving the light with a photodetector, and obtaining the depth information by subtracting respective autocorrelation signal components of the object and reference light from signal components of the photo-received interference light and performing Fourier or inverse Fourier transformation thereon, or by performing the subtraction and Fourier or inverse Fourier transformation in reverse order.
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