Ophthalmic apparatus for measuring a sensitivity value of an eye by presenting a light stimulus on a predetermined background illumination to the examinee. Since the luminance entering the eye is dependent on the pupil size, the pupil diameter is also measured. A database of correction functions, values or algorithms is prepared and stored in advance, based on experimental data from same eyes obtained with different pupil diameters, for converting a sensitivity value measured with an arbitrary pupil diameter into a value that would have been measured with a predetermined standard pupil diameter. The correction is based on the ratio of a shape parameter of the pupil, such as the pupil area, divided by the shape parameter corresponding to a pupil with the standard pupil diameter. After determining the shape parameter ratio and correcting the measured sensitivity value, it is classified into one of several sensitivity ranges (steps) by referring to a database of statistical sensitivity value ranges measured with the standard pupil diameter. Furthermore, a mechanism for controlling the stimulus intensity according to the pupil diameter is presented for adjusting the luminance entering the eye.
