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Chapter-19 Topographical Patterns of Irregular Astigmatism

BOOK TITLE: Corneal Topography in Clinical Practice (Pentacam System): Basics and Clinical Interpretation

Author
1. Sinjab Mazen M
ISBN
9788184486544
DOI
10.5005/jp/books/10177_19
Edition
1/e
Publishing Year
2009
Pages
8
Author Affiliations
1. Medical School, Damascus University, Syria, Damascus University; Al Mouasat University Hospital, Damascus, Syria; Damascus University; Al Zahra Medical Group, Damascus, Syria; Elite Medical Center in Riyadh, Kingdom of Saudi Arabia (KSA), Damascus University; Al Mouasat University Hospital, Damascus, Syria; Damascus University; Damascus, Syria; Elite Medical Center in Riyadh, KSA, Damascus University, Damascus, Syria, Damascus University, Damascus, Syria; Damascus University, Damascus, Syria; Dr Haifa Eye Hospital, Bahrain
Chapter keywords

Abstract

Chapter nineteen talks about topographical patterns of irregular astigmatism. This Chapter divides irregular astigmatism into defined and undefined patterns. Astigmatism is usually regular, which means that the principal meridians are perpendicular to each other, and astigmatism is correctable with conventional spherocylindrical lenses. However, when the cornea have an irregular shape that cannot be described by spherical, toric, or conic section aspheric geometry we call that this patient shows irregular astigmatism.

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