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Related Experiment Video

Updated: Nov 29, 2025

Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis

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Published on: November 12, 2015

ABCD: A new classification for keratoconus.

Michael W Belin¹, Gairik Kundu², Naren Shetty³

¹Department of Ophthalmology, University of Arizona, Tucson, USA.

Indian Journal of Ophthalmology

|November 24, 2020

Summary

This summary is machine-generated.

A new staging system for keratoconus, the Belin ABCD system, uses corneal curvature and thickness at the thinnest point for improved classification. This advanced method better reflects anatomical changes in ectatic corneal diseases.

Keywords:

ABCD classification ectasia keratoconus

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Area of Science:

Ophthalmology
Corneal Disease Research
Ophthalmic Imaging Analysis

Background:

Advances in diagnosing and treating ectatic corneal diseases necessitate updated classification methods.
Current staging systems may not fully capture the anatomical complexities of these conditions.

Purpose of the Study:

To introduce and describe the novel Belin ABCD keratoconus staging system.
To highlight the advantages of the Belin ABCD system in classifying ectatic corneal diseases.

Main Methods:

The Belin ABCD keratoconus staging system integrates anterior and posterior corneal curvature.
It utilizes pachymetry measurements centered on the cornea's thinnest point.
Distance visual acuity is incorporated into the grading system (0-4).

Main Results:

The new system incorporates posterior curvature and thickness measurements relative to the thinnest point.
This approach contrasts with older methods relying on apical measurements.
The Belin ABCD system provides a more accurate reflection of anatomical changes.

Conclusions:

The Belin ABCD keratoconus staging system offers a more modern and accurate approach to classifying ectatic corneal diseases.
Its focus on the thinnest point of the cornea improves the reflection of anatomical alterations.
This system is expected to enhance diagnosis and treatment strategies for keratoconus.