Eye examining instrument

An eye examining instrument comprising:

• an eye examining system provided with a fixed objective means;
• a generating source for emitting elastic waves;
• wave reflecting means disposed between said objective means and the eye to be examined for reflecting elastic waves from said generating source toward the eye to be examined;
• a receiver for receiving elastic waves from the eye to be examined and for emitting an electric signal stream;
• and
• a comparator circuit, connected with said receiver, for comparing said electric signal stream and standard signals relating to a predetermined distance between said objective means and the eye to be examined.

An eye examining instrument comprising:

• an eye examining system, provided with a fixed objective means, for projecting an examining beam on to the fundus of an eye to be examined;
• an ultrasonic generator connected with said eye examining system and directed in a predetermined direction;
• a receiver, connected with said eye examining system and directed in a predetermined direction, for receiving the ultrasonic waves reflected by the cornea of the eye to be examined;
• a comparator electrically connected with said receiver, for comparing a time interval and an intensity detected by said receiver with a time interval and an intensity corresponding to a desired spacing and alignment between said objective means and the eye to be examined.