Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Corneal model.

Paul-Rolf Preussner1, Jochen Wahl, Christina Kramann

  • 1Universitäts-Augenklinik, Mainz, Germany.

Journal of Cataract and Refractive Surgery
|March 29, 2003
PubMed
Summary
This summary is machine-generated.

A new simple model (SM) accurately describes the cornea's optical region, outperforming Zernike models for small zones. This offers a precise basis for refractive surgeries like customized corneal and cataract procedures.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Comment on: Accuracy of thick and thin intraocular lens power formulas using paraxial vergence calculation.

Journal of cataract and refractive surgery·2025
Same author

Influence of Crosslinking on Astigmatism Vector in Keratoconus: A Vector Analysis.

Ophthalmology and therapy·2025
Same author

[Basic aspects of IOL calculation].

Die Ophthalmologie·2024
Same author

Accuracy comparison of tomography devices for ray tracing-based intraocular lens calculation.

Journal of cataract and refractive surgery·2023
Same author

Distribution and causes of blindness and severe visual impairment in children at a tertiary referral centre in Rwanda.

The British journal of ophthalmology·2023
Same author

Comparison of the Automated Pattern-Noise (PANO) Glaucoma Test with the HFA, an FDT Stimulus, and the Fundus Area Cup-to-disk Ratio.

Journal of current glaucoma practice·2022
Same journal

Light adjustable lens implantation with cataract surgery in eyes with macular pathology.

Journal of cataract and refractive surgery·2026
Same journal

Comment on: Use of intracameral antibiotics prophylaxis in patients with posterior capsule rupture during cataract surgery: systemic review and meta-analysis.

Journal of cataract and refractive surgery·2026
Same journal

Dehydration and Rehydration Behavior of Ultra-High-Fluence Extracorporeal Cross-Linked Corneal Allogenic Intrastromal Ring Segments (ECO-CAIRS).

Journal of cataract and refractive surgery·2026
Same journal

Multimodal Deep Learning for Predicting Postoperative Vault and Selecting ICL Sizes Using AS-OCT and UBM Images.

Journal of cataract and refractive surgery·2026
Same journal

Reply: Evaluating large language models vs residents in cataract and refractive surgery: comparative analysis using the American Academy of Ophthalmology Self-Assessment Program.

Journal of cataract and refractive surgery·2026
Same journal

Comment on: Evaluating large language models vs residents in cataract and refractive surgery: comparative analysis using the American Academy of Ophthalmology Self-Assessment Program.

Journal of cataract and refractive surgery·2026
See all related articles

Area of Science:

  • Ophthalmology
  • Optical Engineering
  • Biomedical Optics

Background:

  • Accurate corneal modeling is crucial for refractive surgery planning.
  • Current models, like Zernike polynomials, have limitations in describing the optical zone.
  • A simplified approach may offer improved accuracy and clinical utility.

Purpose of the Study:

  • To develop a simplified model (SM) for describing the cornea's optical region with minimal parameters.
  • To compare the accuracy of the SM against established mathematical models (Zernike polynomials).
  • To evaluate the SM's suitability for refractive surgery applications.

Main Methods:

  • Corneal surfaces were approximated using a simple model (SM) defined by vertex radii, angles, eccentricity, and decentration parameters.

Related Experiment Videos

  • The SM was compared to 4th (Z4) and 8th (Z8) order Zernike polynomial models.
  • Residual refractive errors were calculated via numerical ray tracing in 100 healthy eyes.

    • Main Results:

    • The SM achieved approximation accuracy comparable to the reproducibility of topographic measurements.
    • For optical zones up to 4.0 mm, the SM demonstrated higher accuracy than the Z4 model.
    • The SM's parameters correlate with conventional corneal measurements.

    Conclusions:

    • The SM provides a highly accurate representation of the cornea's optical zone, suitable for refractive interventions.
    • Unlike Zernike polynomials, the SM does not compromise central optical quality for peripheral improvements.
    • The SM offers a valuable tool for customized corneal and cataract surgery planning.