Memphis Eye & Cataract Associates Ambulatory Surgery Center

Other

Memphis Eye & Contact Associates

James F Freeman

Roy E Williams

Jerre M Freeman

An automated eye corneal striae detection system for use with a refractive laser system includes a cornea illuminator, a video camera interface, a computer, and a video display for showing possible eye corneal striae to the surgeon. The computer includes an interface to control the corneal illuminator, a video frame grabber which extracts images of the eye cornea from the video camera, and is programmed to detect and recognize eye corneal striae. The striae detection algorithm finds possible cornea striae, determines their location, or position, on the cornea and analyzes their shape. After all possible eye corneal striae are detected and analyzed, they are displayed for the surgeon on an external video display. The surgeon can then make a determination as to whether the corneal LASIK flap should be refloated, adjusted or smoothed again.

System to automatically detect eye corneal striae

A laser eye surgery system includes a laser for producing a laser beam capable of making refractive corrections, an optical system for shaping and conditioning the laser beam, a digital micromirror device (DMD) for reflecting the shaped and conditioned beam toward the eye, a computer system for controlling the mirrors of the DMD, and an eye tracking system which tracks the position of the eye and provides feedback to the computer system. The computer system includes software which permits the DMD to emulate the patterns and laser beam control provided in all prior art broadbeam systems and scanning spot systems. All that is required is a selection in the software to operate thereunder. Moreover, the laser surgery system can be coupled to or adapted to receive data from corneal topographers or wavefront sensor systems and utilize such data to increase the quality of correction above and beyond prior approaches. Furthermore, the laser surgery system can provide much greater resolution than prior art systems.

Control system for high resolution high speed digital micromirror device for laser refractive eye surgery

A system and method for performing corneal ablation or reshaping with a laser in order to correct aberrations in the optical system of the eye utilizes a wavefront sensor which defines a wavefront correction for the eye and then, based upon that defined wavefront correction, drives a digital micromirror device (DMD) which modulates a laser beam to the eye to perform the correction. As the DMD is a 2-D array of individually controlled mirrors, and the wavefront sensor analysis can provide a sequence of two dimensional arrays of values which together define the wavefront correction for the eye, the combination of the two produces a method for correcting the corneal surface. The system may be operated in either of two manners to achieve optimum refractive corrections: (1) off-line measurement of the eye optical system via the wavefront sensor followed by DMD-based laser refractive surgery, or (2) real-time measurement of the eye optical system via the wavefront sensor which directs a DMD-based laser refractive surgery system.

Laser eye surgery system using wavefront sensor analysis to control digital micromirror device (DMD) mirror patterns

An eye tracking and positioning system for use with a refractive laser system includes a camera interface, a computer, and a system for moving the patient relative to the laser beam. The computer includes a video frame grabber which extracts images of the eye from the camera, and is programmed to perform an eye tracking algorithm. The eye tracking algorithm calculates the exact center of the eye pupil, and compares the center with the desired location of the laser beam, as determined by a surgeon, with an image processing algorithm. If the relative location of the eye center and the laser beam fall outside a predetermined value, the patient chair, and thereby the patient, is repositioned relative to the laser beam, as opposed to the laser beam being repositioned relative to the patient. The repositioning counters the movement of the eye.

Eye tracking and positioning system for a refractive laser system

A portable liquid pesticide transfer assembly capable of being removably mounted on a side wall that extends upwardly from a bed portion of a conventional pickup truck. The assembly when so mounted permits liquid pesticide to be transferred through a closed system from the container in which it is marketed to a tank for dispensing purposes without danger of the pesticide contacting the user or the user being subjected to the fumes thereof. The container after the pesticide is removed therefrom is capable of being washed together with the assembly, without the user being subjected to inadvertent contact with the pesticide containing wash water. The assembly includes a closure for removably sealing the container when the container has a quantity of pesticide remaining therein.

Portable liquid pesticide transfer assembly

An assembly capable of removably engaging a first leg of a welder's square, and supporting the welder's square on a substantially horizontal pipe or structural member, with the second leg of the welder's square normally disposed to the longitudinal center line of the pipe or structural member. When the welder's square and assembly are so mounted as a unit on the pipe, the second leg may be used to align a flange relative to an end of the pipe, determine whether an end edge of the pipe is normal to the longitudinal center line of the pipe, and indicate a transverse cutting line on the pipe. Two of the units when disposed back-to-back may be used to longitudinally align two lengths of pipe that have adjacent ends thereof in abutting contact. The assembly may be used to support a welder's square on a substantially horizontal structural member, such as a channel or eye beam, to achieve like results.

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Memphis, TN, United States of America

James F Freeman