Patent ID: 8079709

Claim:
A cornea shape measurement apparatus, comprising: a projecting optical system that includes a first light source for projecting an index for cornea shape measurement onto a cornea of an examinee's eye; an illuminating optical system that includes a second visible light source, which is different from the first light source, for illuminating, with visible light, an anterior segment of the eye, on which a reference mark for injecting a toric intraocular lens for astigmatism correction (TORIC-IOL) is placed; an imaging optical system that includes a two-dimensional imaging device for capturing, at different timings, (i) an index image of the index reflected from the cornea, and (ii) an anterior segment front image for the TORIC-IOL, wherein the anterior segment front image the TORIC-IOL contains the reference mark but does not contain the index; a controller for (a) turning on the first light source to cause the two-dimensional imaging device to capture the index image, based on light which is emitted from the first light source and then reflected from the cornea, and (b) turning on the second visible light source on at a different timing from the first light source to cause the two-dimensional imaging device to capture the anterior segment front image for the TORIC-IOL, based on the visible light which is emitted from the second visible light source and then reflected from the anterior segment of the eye; a memory for storing therein the index image and the anterior segment front image for the TORIC-IOL, based on an output signal from the two-dimensional imaging device; a calculator for determining a direction of an astigmatic axis of the cornea, based on the index image stored in the memory; an image processor for overlaying an astigmatic axis mark indicating the direction of the astigmatic axis on the anterior segment front image for the TORIC-IOL stored in the memory, in accordance with a calculation result by the calculator; and an output appliance for outputting the anterior segment front image for the TORIC-IOL that contains the astigmatic axis mark overlaid by the image processor.