System for the design, manufacture, and testing of custom lenses with known amounts of high-order aberrations.
Now that excimer laser systems can be programmed to correct complex aberrations of the eye on the basis of wave-front measurements, a method is needed to test the accuracy of the system from measurement through treatment. A closed-loop test method was developed to ensure that treatment plans generated by a wavefront measuring system were accurately transferred to and executed by the excimer laser. A surface was analytically defined, and a Shack-Hartmann-based wave-front system was used to formulate a treatment plan, which was downloaded to an excimer laser system. A plastic lens was ablated by the laser and then returned to the wave-front device, where it was measured and compared with the analytically defined wave-front surface. The two surfaces agreed up to 6th-order Zernike terms, validating the accuracy of the system.
Chernyak
Dimitri A
DA
VISX, Incorporated, 3400 Central Expressway, Santa Clara, California 95051, USA. dimitric@visx.com
Campbell
Charles E
CE
D004867:Equipment Design; D005139:Eyeglasses; D006801:Humans; D007834:Lasers; D008420:Manufactured Materials; D008962:Models, Theoretical; D012030:Refractive Errors / Q000628:therapy*