In 1956, Mundt and Hughes used an A-scan on an intraocular tumor, demonstrating the possible use of ultrasound in ophthalmology. Soon a body of research developed on the sound velocities of various tissues and compartments of the eye, and in the 1960s, ultrasound began to be used to measure distances in the eye. B-scan instruments developed in the 1970s, were originally used through closed eyel...
