Blood vessel tracking apparatus

A blood vessel tracking apparatus comprising:

• an illumination system, having a light source and a movable mirror, for illuminating a blood vessel of an eye to be examined with light;
• a sensor for receiving an image of the blood vessel illuminated with light;
• and
• a processing system for calculating, based on an output of said sensor and after a change of an optical path of the light effected by said movable mirror, a diameter of the illuminated blood vessel a plurality of times to produce a plurality of calculated blood-vessel diameters, and for calculating the variations in the calculated blood-vessel diameters, wherein said processing system also determines whether said movable mirror has performed successful tracking of the illuminated blood vessel in accordance with the calculated variations in the blood-vessel diameters.

A blood vessel tracking apparatus comprising:

• an illumination system, having a light source and a movable mirror, for illuminating a blood vessel of an eye to be examined with light;
• a sensor for receiving an image of the blood vessel illuminated with the light;
• and
• a processing system for calculating, based on an output of said sensor, a diameter of the illuminated blood vessel a plurality of times, in order to measure a change in blood vessel diameter based on the calculation, the processing system further determining the occurrence of mistracking of a blood vessel by said movable mirror when the measured change in blood vessel diameter is greater than a predetermined value.

A blood vessel tracking apparatus comprising;

• an illumination system, having a light source and a movable mirror, for illuminating a blood vessel of an eye to be examined with light;
• a sensor for receiving an image of the blood vessel illuminated with light;
• and
• a processing system for calculating, based on an output of said sensor, a diameter of the illuminated blood vessel a plurality of times, after a change of an optical path of the light effected by said movable mirror, wherein said processing system further executes processing for measuring a change in blood vessel diameter based on the calculation and for determining whether the same blood vessel has been used for calculating the blood vessel diameter based on the change in the measured blood vessel diameter.