Related Experiment Video
Updated: Aug 17, 2026
VisualEyes: A Modular Software System for Oculomotor Experimentation
Published on: March 25, 2011
A new schematic eye model incorporating accommodation
A Popiolek-Masajada1, H T Kasprzak
1Institute of Physics, Wroclaw University of Technology, Poland. popiolek@rainbow.if.pwr.wroc.pl
Purpose:
To create a schematic eye model with four refracting surfaces and with the new function describing the crystalline lens profile.
Methods:
The new function describing the crystalline lens profile is a combination of hyperbolic cosine functions modulated by hyperbolic tangent functions. It ensures the continuity of the radius of curvature along the whole lens profile. Recent experimental results on cornea and lens shape measurements have been applied to the proposed model. The new function describing the lens profile has been used to model the eye during accommodation.
Results:
Spherical aberration and modulation transfer function have been computed to test the eye model. Results of calculations are in agreement with experimental findings.
Conclusions:
The calculations show that spherical aberrations of the cornea and crystalline lens cancel each other. The new description of the crystalline lens offers a reduction of longitudinal spherical aberration. The image quality of the unaccommodated eye model is slightly better than that of the accommodated one.
