Analysis and applications of vision correction via accommodating intraocular lens (AIOL) are presented. By Gaussian optics, analytic formulas for the accommodation rate function (M) for two-optics and three-optics systems are derived and compared with the exact numerical results. In a single-optics AIOL, typical value of M is (0.5-1.5) D/mm, for an IOL power of (10-20) diopter. For a given IOL power, higher M is achieved in positive-IOL than negative-IOL. In the dual-optics AIOL, maximum accommodation is predicted when the front positive-optics moves toward the corneal plan and the back negative-optics moves backward. Our analytic formulas predict that greater accommodative rate may be achieved by using a positive-powered front optics, a general feature when either front or back optics is mobile. The M function is used to find the piggy-back IOL power for customized design based on the individual ocular parameters. Many of the new features demonstrated in this study can be easily realized by our analytic formulas, but not by raytracing method.
We found that the bandwidth in the formula calculating the depth resolution of OCT is
usually not the same as the bandwidth of the light source; the effective spectral profile for the
interfering signal is determined by the dot product of the electric vectors of the light field in the
two interfering arms. We thus introduced a new concept: the effective bandwidth in spectraldomain
OCT (SD-OCT). Through theoretical and experimental analyses we found that the
effective bandwidth is a function of both the polarization matching conditions (PMC) and the
path length difference (PLD) between the sample and reference arms.
KEYWORDS: Ray tracing, Eye, Cornea, Monochromatic aberrations, Image quality, Eye models, Zemax, Optical design, Human vision and color perception, LASIK
Using raytracing method (ZEMAX program), the reduction of SA of the whole human eye may be reduced via the
combined effects of asphericity (Q) and the ratio of the front and back surface of an IOL. The overall SA for best image
quality may be defined by Q* when the image position off axis is reduced to that of the paraxial. Our calculations show
the following general features: (1) For a give Q value, the influence on the SA is proportional to the surface power; (2) for minimal whole eye SA, negative Q is needed in IOL; (3) for a given IOL power, the Q* is smaller when the front surface has a smaller power. All above features derived from numerical raytracing method are consistent with analytic formulas.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.