초록 ▼

A method and surgical technique for corneal reshaping and for presbyopia correction are provided. The preferred embodiments of the system consists of a scanner, a beam spot controller and coupling fibers and the basic laser having a wavelength of (190-310) nm, (0.5-3.2) microns and (5.6-6.2) microns

A method and surgical technique for corneal reshaping and for presbyopia correction are provided. The preferred embodiments of the system consists of a scanner, a beam spot controller and coupling fibers and the basic laser having a wavelength of (190-310) nm, (0.5-3.2) microns and (5.6-6.2) microns and a pulse duration of about (10-150) nanoseconds, (10-500) microseconds and true continuous wave. New mid-infrared gas lasers are provided for the corneal reshaping procedures. Presbyopia is treated by a method which uses ablative laser to ablate the sclera tissue and increase the accommodation of the ciliary body. The tissue bleeding is prevented by a dual-beam system having ablative and coagulation lasers. The preferred embodiments include short pulse ablative lasers (pulse duration less than 200 microseconds) with wavelength range of (0.15-3.2) microns and the long pulse (longer than 200 microseconds) coagulative lasers at (0.5-10.6) microns. Compact diode lasers of (980-2100) nm and diode-pumped solid state laser at about 2.9 microns for radial ablation patterns on the sclera ciliary body of a cornea are also disclosed for presbyopia correction using the mechanism of sclera expansion.

대표청구항 ▼

[ I claim:] [1.]1. A method of performing refractive surgery by reshaping a portion of corneal tissue, said method comprising the steps of:selecting a gas laser generated by transverse electrical discharge in a mixture of neural gases including at least helium gas and having a pulsed output beams of

[ I claim:] [1.]1. A method of performing refractive surgery by reshaping a portion of corneal tissue, said method comprising the steps of:selecting a gas laser generated by transverse electrical discharge in a mixture of neural gases including at least helium gas and having a pulsed output beams of predetermined mid-IR wavelength of (2.7-3.2) microns;selecting a beam spot controller mechanism, said spot controller consisting of an internal magentic coupler integrated inside the laser cavity having a pin-hole size of about (2-10) mm;focusing the output beam to a spot size of about (0.05-2.5) mm on the corneal surface;selecting a scanning mechanism for scanning said selected laser output beam;coupling said laser beam to a scanning device for scanning said laser beam over a predetermined corneal surface area to remove corneal tissue, whereby a patient's vision is corrected by reshaping the cornea.