Early Detection of Keratoconus Through Astigmatism Monitoring
Early Detection of Keratoconus Through Astigmatism Monitoring
Date
2025
Auteurs
BENNOUR SOUMIA
LEGHBALI DOUNIA
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Résumé
Astigmatism particularly when it progresses or changes axis, can be one of the earliest warning signs of developing keratoconus but only the monitoring of specific topographic indices allows for a reliable diagnostic confirmation.
Methods and Materials:
A retrospective-method study was conducted on 32 patients under the age of 25 in two ophthalmology clinics. The analysis included refraction and corneal imaging using Pentacam, with extraction of topographic indices to assess the accuracy of these parameters in detecting early keratoconus.
Results:
Myopic astigmatism was common and its progression was significant in keratoconic eyes. The topographic indices IVA, ISV, KI, IS, and IHA showed strong discriminative power (AUC > 0.83), with KI being the most effective. The CKI and IHD indices were less sensitive.
Conclusion:
Changes in astigmatism should raise suspicion of keratoconus but it is topographic indices that provide a reliable diagnostic confirmation. Integrating the monitoring of these indices into optometric practice enables earlier and more accurate screening.
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Mots-clés
Astigmatism, keratoconus, topographic indices, Pentacam, early detection, optometry.