Patent ID: 7731361

Claim:
An ophthalmic apparatus comprising: a measurement unit arranged to perform one of examination and measurement of an examinee's eye; a projection optical system included in the measurement unit and comprising a light source, which is arranged to project an infrared alignment target onto an anterior segment of the eye; an image-pickup optical system included in the measurement unit and comprising a two-dimensional image-pickup element having a sensitivity in at least an infrared range, which is arranged to pick up an image of the anterior segment with an image of the projected alignment target by the image-pickup element; and a calculation and control unit arranged to obtain the anterior segment image based on an image signal from the image-pickup element, detect the alignment target image, and based on a result of the detection, detect an alignment condition of the measurement unit with respect to the eye, wherein the calculation and control unit obtains luminance distribution of the image signal from the image-pickup element, judges whether or not the number of pixels or an integral value of which luminance goes over a threshold level is more than a given permissible range, and when the judgment is affirmative, decreases at least one of light intensity of the alignment target and gain of the image signal from the image-pickup element.