Method and apparatus for generating localized hyperthermia

A method for generating controlled hyperthermia in a target region of corneal tissue, the method comprising the steps of:

• generating a series of waves of ultrasound having a plurality of frequencies within the range of about 20 MHz to about 500 MHz;
• propagating said ultrasound into said target region of cornea tissue;
• and
• controlling the frequency components of said ultrasound to deposit acoustical energy such that said components constructively interfere in said tissue within said target region.

A method of performing corneal thermokeratoplasty, the method of comprising the steps of:

• generating a series of waves of ultrasound ranging from about 20 MHz to about 500 MHz;
• propagating said ultrasound toward a cornea;
• focusing said ultrasound within the collagen region of said cornea;
• and
• varying the frequency of said ultrasound to provide a plurality of frequencies and thereby generate a constructive interference hyperthermia zone within the collagen region at a selected location
• whereby, the collagenous tissue shrinks in a controlled manner in said hyperthermia zone, thereby modifying the shape of the cornea.