ophthalmic devices

Abstract

This system generates high-quality OCT images even when using a light source with low sweep stability. [Solution] An ophthalmic device comprising a wavelength-swept light source, an OCT optical system that splits the light from the wavelength-swept light source into measurement light and reference light and detects the interference signal between the reflected light of the measurement light and the reference light, and a calculation control unit, wherein the calculation control unit performs a mapping information acquisition process that converts the reference interference signal acquired for a reference object into first wavenumber data according to first mapping information and converts the reference interference signal into second wavenumber data according to second mapping information, and determines third mapping information based on which of the first wavenumber data and second wavenumber data has better signal quality when Fourier transformed and corresponds to the reference object, and an OCT image acquisition process that converts the tissue interference signal acquired for the tissue of the eye under examination into third wavenumber data according to the third mapping information, and performs a Fourier transform on the third wavenumber data to acquire an OCT image.

Claims

1. An OCT optical system including a wavelength-swept light source, an optical splitter that splits the light from the wavelength-swept light source into a measurement light and a reference light, and a detector that detects the interference signal between the reflected light of the measurement light and the reference light, Calculation control unit and Equipped with, The calculation control unit, The mapping information acquisition process involves converting the reference interference signal, which is the interference signal acquired for a reference object, into first wavenumber data according to first mapping information, converting the reference interference signal into second wavenumber data according to second mapping information different from the first mapping information, and determining third mapping information different from both the first and second mapping information based on which of the first and second wavenumber data has good signal quality corresponding to the reference object when Fourier transformed. The OCT image acquisition process involves converting the tissue interference signal, which is the interference signal obtained from the tissue of the eye under examination, into third wavenumber data according to the third mapping information, and then performing a Fourier transform on the third wavenumber data to obtain an OCT image of the tissue of the eye under examination. An ophthalmic device that performs this function.

2. An ophthalmic device according to claim 1, The calculation control unit is an ophthalmic device that generates the first wavenumber data and the second wavenumber data in a stepwise manner.

3. An ophthalmic device according to claim 1 or 2, The ophthalmic device wherein the calculation control unit determines the third mapping information in the mapping information acquisition process based on a polynomial of a higher order than the polynomial that forms the basis of the second mapping information.

4. An ophthalmic device according to any one of claims 1 to 3, The OCT optical system is an ophthalmic device having a reference interference signal generation unit that generates the reference interference signal.

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