Ophthalmic tomographic imager with corneo-retinal image analysis

An optical image measuring device, comprising:

• an optical system configured to split a light from a light source into a signal light and a reference light, split an optical path of the reference light into a plurality of optical paths having different optical path lengths to split the reference light into a plurality of reference lights, make the plurality of reference lights propagated through the plurality of optical paths, respectively, interfere with the signal light propagated through a measured object, and generate an interference light that reflects a morphology in each of a plurality of depth positions of the measured object;
• a detector configured to detect the generated interference light to generate a detection signal;
• an image forming part configured to form a plurality of tomographic images each representing the morphology of the measured object in a corresponding position among the plurality of depth positions based on the generated detection signal;
• and
• an analyzer configured to analyze the plurality of tomographic images to obtain a distance between a position in one tomographic image of the plurality of tomographic images and a position in other tomographic image, wherein:
• the measured object is a living eye;
• the plurality of reference lights include a first reference light propagating on a first optical path having an optical path length corresponding to a retina of the living eye, and a second reference light propagating on a second optical path having an optical path length corresponding to a cornea of the living eye;
• the image forming part is configured to extract a first signal component corresponding to an interference component of the first reference light and the signal light reflected by the retina from the detection signal to form a first tomographic image showing a morphology of the retina as the one tomographic image, and extract a second signal component corresponding to an interference component of the second reference light and the signal light reflected by the cornea from the detection signal to form a second tomographic image showing a morphology of the cornea as the other tomographic image;
• and
• the analyzer is configured to analyze the first and second tomographic images to obtain a corneo-retinal distance of the living eye, wherein the analyzer includes a magnification calculator configured to obtain, as the predetermined physical quantity, a magnification of an ocular optical system of the living eye based on the obtained corneo-retinal distance, wherein:
• the magnification calculator is configured to obtain the magnification based on optical information of the ocular optical system included in ocular optical information stored in advance and the obtained corneo-retinal distance,
• wherein:
• the ocular optical information includes a value of a radius of curvature of each of a back face and front face of the cornea, a value of a thickness of the cornea, a value of a refractive index of the cornea, a value of a radius of curvature of each of a back face and front face of a crystalline lens, a value of a thickness of the crystalline lens, a value of a refractive index of the crystalline lens, a value of a refractive index of a vitreous body, and a value of an anterior segment distance representing a distance between the front face of the cornea and the back face of the crystalline lens;
• and
• the magnification calculator is configured to subtract the value of the anterior segment distance from the corneo-retinal distance to calculate a posterior segment distance representing a distance between the back face of the crystalline lens and the surface of the retina, form an eye model based on the ocular optical information and the posterior segment distance, and obtain the magnification based on the eye model.