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A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible

A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible

Published on: January 28, 2020

Comparative postoperative topography pattern recognition analysis using axial vs tangential curvature maps.

Ravi S Shah¹, Sumitra S Khandelwal, Jeffrey M Goshe

¹From the Department of Ophthalmology, Roski Eye Institute, Keck School of Medicine, University of Southern California (Shah), Los Angeles, California, Baylor College of Medicine, Cullen Eye Institute (Khandelwal), Houston, Texas, Department of Ophthalmology, Cole Eye Institute, Cleveland Clinic (Goshe, Randleman), Cleveland, Ohio, and Department of Ophthalmology, NYU School of Medicine, Langone Medical Center (Haberman), New York, New York, USA.

Journal of Cataract and Refractive Surgery

|June 3, 2020

Summary

This summary is machine-generated.

Novice reviewers more accurately identified refractive surgery status using tangential curvature maps compared to axial maps. Tangential maps improve accuracy for post-LASIK intraocular lens calculations.

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Published on: June 24, 2025

Area of Science:

Ophthalmology
Corneal Surgery
Ophthalmic Imaging

Background:

Accurate assessment of prior refractive surgery is crucial for cataract surgery planning.
Novice reviewers may struggle with interpreting corneal topography patterns.

Purpose of the Study:

To evaluate the prediction accuracy of refractive surgery status by novice reviewers using corneal topography.
To compare the diagnostic performance of axial versus tangential anterior curvature maps.

Main Methods:

A prospective case-control study was conducted across four U.S. academic centers.
Fifty-two novice reviewers evaluated 60 images from 30 eyes with known refractive surgery status.
Images included eyes with myopic/hyperopic ablations or no prior surgery, using Placido-based topography or Scheimpflug-based tomography.

Main Results:

Tangential maps showed significantly higher accuracy (82.9% myopic, 90.9% hyperopic) than axial maps (55.0% myopic, 58.3% hyperopic) for identifying post-refractive surgery eyes.
For eyes with no ablation, axial maps were more accurate (62.8%) than tangential maps (15.4%).
No significant differences were found between Placido and Scheimpflug devices or reviewer training levels.

Conclusions:

Tangential curvature maps significantly enhance pattern recognition accuracy for post-myopic and post-hyperopic ablations by novice reviewers.
Utilizing tangential maps can improve intraocular lens (IOL) calculator selection and power calculation accuracy in post-LASIK eyes.