Three-dimensional ray-tracing model for the study of advanced refractive errors in keratoconus

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Computational Optics

Background:

• Advanced corneal refractive errors, particularly in keratoconus (KC), pose significant challenges for vision correction.
• Existing intraocular lens (IOL) models may not adequately address the irregular astigmatism associated with KC.

Purpose of the Study:

• To develop and validate a numerical three-dimensional (3D) ray-tracing model for analyzing complex corneal refractive errors.
• To investigate the potential of customizing IOLs to improve visual outcomes in KC patients.

Main Methods:

• Utilized Scheimpflug photography to obtain corneal elevation data.
• Developed a mathematical model of a KC patient's cornea for 3D ray tracing based on Snell's law.
• Incorporated a commercial IOL model and simulated modifications to its posterior surface.

Main Results:

• The 3D ray-tracing model successfully simulated refractive error correction.
• Modifying the posterior IOL surface led to a significant improvement in imaging quality.
• Root Mean Square (RMS) values were reduced by approximately 50% near the retina for both on- and off-axis conditions.

Conclusions:

• The developed 3D ray-tracing model provides a robust platform for simulating customized IOLs.
• This approach holds promise for correcting advanced, irregular refractive errors in keratoconus patients.
• Customized IOLs based on this model could enhance visual acuity and quality of vision in KC.