Customized aspheric intraocular lenses calculated with real ray tracing

Area of Science:

• Ophthalmic optics
• Optical engineering
• Biomedical engineering

Background:

• Pseudophakic eyes require precise intraocular lens (IOL) geometry for optimal visual outcomes.
• Wavefront error is a critical factor influencing visual quality after cataract surgery.
• Existing IOLs may not fully correct higher-order aberrations (HOAs).

Purpose of the Study:

• To calculate the exact geometry of custom intraocular lenses (IOLs) for pseudophakic eyes.
• To theoretically predict residual wavefront error using real ray tracing.
• To optimize IOL design for minimizing root mean square wavefront error.

Main Methods:

• Construction of individual computer models from patient measurements (corneal topography, axial length).
• Optimization of custom IOL geometry (spherical, aspheric, toric, toric aspheric) via real ray tracing.
• Simulation and approximation of residual wavefront error using Zernike polynomials.

Main Results:

• Spherical IOLs effectively corrected defocus; toric IOLs corrected astigmatism.
• Aspheric IOLs significantly reduced spherical aberration but had a limited effect on total HOAs.
• Theoretical predictions aligned with clinical wavefront measurements in pseudophakic eyes.

Conclusions:

• Real ray tracing enables precise custom IOL geometry calculation to minimize wavefront error.
• Aspheric IOLs offer significant spherical aberration reduction.
• Limited HOA correction by current custom aspheric IOLs may explain variable visual performance benefits.