Gullstrand Eye Model

Methods

We did ray tracing in CISET. The data from ray tracing was ported to ISET, from which we could plot the resulting image and do analysis on the sensor image. Using this method, we measured various characteristics of the eye such as the spherical aberration, chromatic aberration, and linespread function.

Results

Comparison of LSA of our Gullstrand eye model in CISET versus data from Navarro's 1985 paper.

Comparison of linespread function and chromatic aberration of our Gullstrand eye model in CISET versus the actual human linespread function and data from Navarro's 1985 paper. The linespread functions are pretty comparable, and the chromatic aberration of our lens follows similar trends as modeled by Navarro.

Comparison of polychromatic PSF of our Gullstrand eye model as a function of aperture in CISET versus data from Navarro's 1985 paper. We also see that smaller aperture leads to a sharper PSF. However, we're not sure why the larger aperture does not allow more overall light through the lens in either model.

Comparison of the effects of defocus on the polychromatic MTF of our Gullstrand eye model in CISET versus data from Navarro's 1999 paper. The line in red is our sensor defocused, which has a similar characteristic to Navarro's defocused model.

Conclusions

Based on the results we measured, we concluded that the Gullstrand eye model in CISET correlated fairly well with the Navarro Gullstrand model.

Appendix

File:Gullstrand.zip gullstrand.dat lens file for integrating into CISET