Patent ID: 7344249

Claim:
An ophthalmic apparatus for examining and evaluating a visual function of an eye of a patient, comprising: a presentation unit which presents an examination target to the patient's eye; a storage unit which stores therein plural pieces of subjective information obtained from the patient as to whether or not the patient can visually recognize the presented examination target; a calculation unit which calculates an objective evaluation value for the patient's eye based upon the stored subjective information; and wherein the calculation unit performs multiple classification analysis using discriminating function expressed by a formula: z=a 1 x 1 +a 2 x 2 +a 3 x 3 + . . . +a n x n where z represents an object variable, x n represents an explanatory variable and a n represents a coefficient, wherein the plural pieces of stored subjective information are employed as the explanatory variable x n , wherein values obtained by employing a membership function and a threshold α (0<α<1) are employed as a maximum value and a minimum value of the coefficient a n , the membership function using a curve obtained by bending a curve of probability-of-seeing at a position where the probability-of-seeing is equal to 50%, wherein prevalence is obtained as an evaluation value by applying a minimum value z min and a maximum value z max of the object variables, obtained by the explanatory variable x n and the minimum value a min and the maximum value a max of the coefficient a n , to a predetermined normal distribution representing prevalence, an output unit which outputs the calculated evaluation value.