Ophthalmologic apparatus having corneal thickness correction
AssigneeCanon Kabushiki Kaisha
InventorManabu Wada
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Abstract
An ophthalmologic apparatus images a cross-section of the cornea of the eye to be examined based on return light from the eye illuminated with measurement light, measures a corneal thickness from a cornea cross-sectional image of the imaged eye, and corrects the corneal thickness based on the position of the cornea cross-sectional image on an imaging plane.
Claims26
An ophthalmologic apparatus comprising:
- an imaging unit configured to image a cross-section of a cornea of an eye to be examined based on return light from the eye illuminated with corneal thickness measurement light;
- a measurement unit configured to measure a corneal thickness from a cornea cross-sectional image of the eye imaged by said imaging unit;
- a correction value obtaining unit configured to obtain a correction value corresponding to an error in the measured corneal thickness, the error being generated in accordance with a curvature radius of the cornea, based on a characteristic curve;
- a correction unit configured to correct the measured corneal thickness based on the obtained correction value.
A control method for an ophthalmologic apparatus having an imaging unit configured to image a cross-section of a cornea of an eye to be examined based on return light from the eye illuminated with corneal thickness measurement light, the method comprising the steps of:
- measuring a corneal thickness from the cornea cross-sectional image of the eye imaged by the imaging unit;
- obtaining a correction value corresponding to an error in the measured corneal thickness, the error being generated in accordance with a curvature radius of the cornea, based on a characteristic curve;
- and
- correcting the measured corneal thickness based on the obtained correction value.
A processing apparatus comprising:
- a corneal thickness obtaining unit configured to obtain a corneal thickness from a cornea cross-sectional image of an eye to be examined, which an imaging unit images based on return light from the eye illuminated with corneal thickness measurement light;
- a correction value obtaining unit configured to obtain a correction value corresponding to an error in the measured corneal thickness, the error being generated in accordance with a curvature radius of the cornea, based on a characteristic curve;
- and
- a correction unit configured to correct the obtained corneal thickness based on the obtained correction value.
A processing method comprising the steps of:
- obtaining a corneal thickness from a cornea cross-sectional image of an eye to be examined, which an imaging unit images based on return light from the eye illuminated with corneal thickness measurement light;
- obtaining a correction value corresponding to an error in the measured corneal thickness, the error being generated in accordance with a curvature radius of the cornea, based on a characteristic curve;
- and
- correcting the obtained corneal thickness based on the obtained correction value.
Dependencies are inferred from the claim text.