Comparison of Four Different Aberrometers for Evaluation of Higher Order Visual Aberrations

An aberrometer measures visual aberrations by mapping how light rays travel through the eye
and by providing maps using colored gradients to represent the magnitude of refractive
errors of the eye.

The purpose of this study is to compare 4 different aberrometers -Wavescan (Visx
Technology), Zywave (Bausch & Lomb), Ladarwave aberrometer (Alcon Inc.) and Allegro Analyzer
(Alcon Inc). In particular, the investigators propose to focus on the ability of these
devices to display the higher order visual aberrations and to compare the quality of outputs
from these 4 devices in normal healthy subjects.