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Updated: Jun 20, 2026
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Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
Published on: September 20, 2024
Analysis of optimized profiles for 'aberration-free' refractive surgery
Samuel Arba-Mosquera1, Diego de Ortueta
1Grupo de Investigación de Cirugía Refractiva y Calidad de Visión, Instituto de Oftalmobiología Aplicada, University of Valladolid, Valladolid, E-47005, Spain. samuel.arba.mosquera@eye-tech.net
Summary
This study introduces an aberration-free profile model for refractive surgery, demonstrating significant visual improvements and minimal induced aberrations in clinical evaluations. The findings suggest these profiles enhance surgical outcomes and reduce the need for nomograms.
Area of Science:
- Ophthalmology
- Corneal Surgery
- Optical Engineering
Background:
- Refractive surgery aims to correct vision by reshaping the cornea.
- Corneal aberrations can impact visual quality post-surgery.
- Developing precise surgical profiles is crucial for optimal outcomes.
Purpose of the Study:
- To model aberration-free corneal profiles for refractive surgery.
- To clinically assess the impact of treatments using these theoretical profiles.
- To evaluate post-operative corneal aberrations and visual outcomes.
Main Methods:
- Deduced aberration-free profiles using Zernike expansion and corneal geometry.
- Incorporated focus-shift compensation by preserving anterior corneal surface optical focus.
- Simulated surgical performance via ray-tracing.
- Retrospectively analyzed visual outcomes, corneal wavefront aberrations, and asphericity in 100 eyes.
Main Results:
- 'Aberration-free' profiles theoretically preserve aberrations, becoming more oblate/prolate post-myopic/hyperopic treatment.
- 94% of eyes achieved emmetropia within +/-0.50 D.
- Significant improvement in Best Spectacle-Corrected Visual Acuity (BSCVA).
- Induced corneal aberrations (HO-RMS, spherical aberration, coma) were below clinically relevant levels.
- Induction of positive asphericity correlated with achieved correction.
Conclusions:
- 'Aberration-free' patterns, considering factors like blending zones and biomechanics, yield results comparable to customisation.
- Ideal corneal profiles can improve clinical outcomes in refractive surgery.
- Reduced need for nomograms and diminished induced aberrations are expected.
