Retinal blood flow measuring apparatus using a laser beam

A retinal blood flow measuring apparatus comprising:

• an irradiation system for spot-applying a laser beam for measurement onto a blood flow in a fundus of an eye to be examined;
• a light receiving device for receiving the reflected light of the laser beam for measurement from the fundus of the eye, the blood flow condition of the fundus of the eye being measured from an output signal of said light receiving device;
• and
• a prescribing member for prescribing the position of the reflected light from the fundus of the eye in the direction of depth of the fundus of the eye,
• wherein said prescribing member has first light beam limiting means disposed at a position between the eye to be examined and said light receiving device which is conjugate with the pupil of the eye to be examined and which is eccentric relative to the position of the laser beam for measurement on the pupil of the eye to be examined, and second light beam limiting means disposed at a position conjugate with the fundus of the eve to be examined.