![]() x–axis tilt, the measured x–axis comas with both systems were very close to the predicted values for five of the six surfaces. As predicted, no significant coma was detected in both systems when model surfaces were not tilted. Relative to the predicted spherical aberrations with or without tilt, both the ATLAS 995 and the E300 provided over–estimates for all six surfaces with mean differences of 0.08 (44%) and 0.06 (32%) microns respectively. ![]() The accuracy of the Pentacam (Oculus, Inc) was tested by measuring Zernike aberrations for 26 young adult subjects (aged from 21 to 35 yrs and with mean Rx of –1.46D) and comparing the results with those obtained from the Humphrey ATLAS. : The accuracy of a Humphrey Corneal Topographer System ATLAS 995 (Carl Zeiss Medtec, Inc) and an E300 Corneal Topogragher (Medmont International Pty Ltd) was tested by using these systems to measure both spherical aberration and x–axis coma for six aspheric standard surfaces (Sterling International Technologies, Inc) rotated 0 and 4.5 deg. ![]() To test the accuracy of three optical systems in measuring corneal aberrations using either calibration of model eyes or comparison of data from the human eyes. ![]()
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March 2023
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