Optical Biometry Explained | 合法醫療器材資訊網

Opticalbiometryisthecurrentstandardforintraocularlens(IOL)powercalculationsinclinicalpractice.Opticalbiometryisahighlyaccuratenon-invasive​ ...

In September 1999, the first automated non-invasive optical biometry device became available for clinicians – the IOLMaster from Carl Zeiss Meditec. The ZEISS IOLMaster operates as a modified Michelson interferometer and uses infrared laser light (wavelength 780 nm) to provide repeatable and precise measurements of the AL,4  curvature of the anterior corneal surface,5  ACD,6  and the horizontal visible iris diameter (white-to-white diameter, WTW).7

The technique underlying  ZEISS IOLMaster biometry is partial coherence interferometry: A signal is produced as a result of the interference between the light reflected by the tear film and that reflected by the retinal pigmentary epithelium. Several studies comparing the ZEISS IOLMaster device to contact and/or ultrasonographic techniques have ...