Apparatus for medical diagnosis utilizing masking of fixation point

An apparatus for medical diagnosis employing fixation point masking, enabling diagnosis of a disease related to brain function by detecting line-of-sight of a subject, comprising:

• eye movement detecting means for detecting eye movement of said subject;
• line-of-sight calculating means responsive to a detection output from said eye movement detecting means for calculating actual movement of the line-of-sight of said subject;
• image presenting means for presenting an image as a task for diagnosis to said subject;
• image inserting means for inserting, when a fixation point is generated in spatial movement of the line-of-sight calculated by said line-of-sight calculating means, a desired masking image of an arbitrary size to the image presented by said image presenting means for an arbitrary time period, after the lapse of an arbitrary time period from fixation;
• and
• determining means responsive to the movement of the line-of-sight calculated by said line-of-sight calculating means when said masking image is inserted to said presented image, determining whether or not the subject is suffering from a disease related to the brain function.