Ocular Q -factor: An approach to eye aberrations analysis

摘要

An approach is proposed to distinguish between the types of aberrations originating from the beam declination in the radial and orthogonal directions. These orthogonal components are derived from the wavefront error map as partial radial and tangential derivatives. We propose defining the ratio of the standard deviation of the radial component to the standard deviation of the tangent component as the eye shape quality factor Q, or ocular Q-factor. Studies showed that this varies with changing the accommodation state, each eye having its own characteristics even for the same patient. The Q-factor becomes lower after surgeries for vision correction. It is higher in the leading eye than in the lagging eye. In four groups of our preliminary study, the Q-factor showed statistical values practically unchanged within the age range of 20-60 years, but becoming lower after the age of 80. The software package can be used as a plug-in to the clinical aberrometers.