Optical quality testing of monofocal intraocular lens implants with a 3 mm and a 4 mm aperture.
The optical quality of 81 monofocal poly(methyl methacrylate) intraocular lenses (IOLs) from eight U.S. firms was tested using a 3 mm aperture, as recommended by the American National Standards Institute Z80.7 standard for IOLs, and a 4 mm aperture. The use of the larger aperture had no effect on the measurements of refractive power and astigmatism. When examined with the 3 mm aperture, the average resolving power of the IOLs was 81% of the diffraction limit; when examined with the 4 mm aperture, the average resolving power was 67% of the diffraction limit. Use of the larger aperture would ensure that a larger area of the IOL had been examined. Incorporating the larger aperture into the ANSI minimum resolution requirement would not appreciably affect the rejection rate for currently manufactured monofocal lenses.
Faaland
R W
RW
Office of Science and Technology, Center for Devices and Radiological Health, Food and Drug Administration, Rockville, Maryland 20857.
Grossman
L W
LW
Igel
D A
DA
D007910:Lenses, Intraocular / Q000592:standards*; D008768:Methylmethacrylates; D055095:Optics and Photonics; D012015:Reference Standards; D014481:United States
D008768:Methylmethacrylates