WASCA Analyzer (Carl Zeiss)

WASCA analyzer (made by Wavefront Sciences) is used in MEL 80 as the aberrometer. It measures 1400 spots on the cornea - each sample on the eye covers a region of 0.2mm by 0.2mm. This gives finer and more precise details for customizing the treatment. The principle of the instrument used to analyze the aberrations is by the Hartmann-Shack wavefront sensing method. The light waves as they come out of the eye are analyzed by an array of microscopic lenses called "lenslets". The array of lenslets dissects the emerging light to a large number of sub apertures and measures the wavefront slope across each aperture. Because each eye has different pattern of the emerging light it provides a unique "blue print" for "custom" correction of the aberrations of that particular eye. The information from such a measurement is captured on a computer disk to be used by the computer delivering the MEL 80 excimer laser when that particular eye is treated.