Practical Astigmatism

Planning and Analysis

Noel Alpins

• Publisher: CRC Press
• Year: 2024
• ISBN:
  9781040136393
• Edition: 1
• Topic: Medizin
• Subtopic: Augenheilkunde & Optometrie

The surgical correction of astigmatism is the last frontier to optimizing visual outcomes for patients. Practical Astigmatism: Planning and Analysis is a comprehensive guide to correcting astigmatism from pre-operative planning to post-operative analysis. This provides readers with unique insight to what actually happened surgically: did the astigmatism over or under correct? Was it on-axis or off-axis? With this book, ophthalmologists will be able to analyze previous procedures with the appropriate nomograms and more often achieve targeted outcomes. Dr. Noel Alpins has developed the Alpins Method of astigmatism to provide accurate planning and analysis of astigmatism procedures. His method focuses on analyzing refractive and corneal astigmatism parameters and using the results in future surgery to improve visual outcomes. The importance of the ocular residual astigmatism (ORA) is detailed when planning astigmatism surgery. Practical Astigmatism features vector planning for refractive laser surgery as well as planning and analysis applied to cataract and limbal relaxing incisions, in addition to demonstrating graphical analysis of astigmatism using high quality vector and fan diagrams, as used in scientific journals. In addition, hemidivisional analysis of the irregular cornea, corneal coupling in incisional and excimer laser surgery for mixed astigmatism and toric IOL planning with total corneal power using corneal topographic astigmatism (CorT total) are addressed as well. Some Questions Answered Inside:

• What is the difference between regular and irregular astigmatism?
• How do I diagnose each, and how does this affect my surgical technique?
• Can I incorporate corneal astigmatism when performing excimer laser surgery?
• Why are my LRIs undercorrecting the astigmatism?
• Is it safe to perform excimer laser on keratoconous patients?
• Which corneal astigmatism measure do I choose and what do I do following a refractive surprise?

Practical Astigmatism: Planning and Analysis will help ophthalmologists, optometrists, and technicians alike address each patient's unique circumstances and act as your in-depth guide to correcting astigmatism. Testimonials…
"For more than three decades I have been listening to, arguing with, and admiring the work of Dr. Noel Alpins in the field of astigmatism. Despite his remote location on the small island of Australia, his knowledge of astigmatism is at the peak of Mt. Everest. There are few others who have devoted their careers to understanding and managing astigmatism for which the world of ophthalmology is truly grateful." - Robert H. Osher, MD "Noel is an original thinker who took on and conquered the complexities of astigmatism analysis, publishing the seminal papers on the way. His work has formed the cornerstone from which our current understanding and management of astigmatism has been built. He is someone from whom we have all learnt a great deal and this book is a testament to this." - Dan Z Reinstein, MD MA(Cantab) FRCSC DABO FRCOphth FEBO

Table of contents

• Cover
• Half Title
• Title
• Copyright
• Dedication
• Contents
• Acknowledgments
• About the Author
• Preface
• Foreword
• Foreword
• Introduction
• Chapter 1 Astigmatism in the Population
• Chapter 2 History of Vectorial Analysis of Astigmatism
• Chapter 3 A Dilemma: The Conflict Between Incisional and Laser Ablative Approaches
• Chapter 4 The Genesis: A Method to the Madness
• Chapter 5 The Nonzero Target and Why It Meets Ongoing Resistance
• Chapter 6 The Basics of the Alpins Method
• Chapter 7 The Astigmatic Indices: Useful Measures That Make It All Worthwhile
• Chapter 8 The Flattening, Steepening, and Rotation of Astigmatism
• Chapter 9 Ocular Residual Astigmatism: When Zero Is Not the Target
• Chapter 10 For Cataract Patients With Astigmatism: Toric Intraocular Lenses
• Chapter 11 Analysis and Management of “Refractive Surprises” After Toric Intraocular Lens Implantation
• Chapter 12 Corneal Topographic Astigmatism: A Measure of Anterior and Total Corneal Power
• Chapter 13 Vector Planning Approach: Optimizing Both Corneal and Refractive Astigmatism
• Chapter 14 Corneal Astigmatism: Less Is More
• Chapter 15 Not Everyone Has Regular Astigmatism: The Hemidivisional Solution
• Chapter 16 Topographic Disparity: Quantifying Corneal Irregularity
• Chapter 17 The Perfect Treatment: Reduction and Regularization
• Chapter 18 Polar Displays Versus Double-Angle Vector Diagrams
• Chapter 19 Clinical Application of the Alpins Method for Clinical Studies
• Chapter 20 Regulatory Adoption
• Chapter 21 Coupling Concepts
• Chapter 22 Mixed Astigmatism
• Chapter 23 How to Perform Your Own Corneal and Refractive Vector Analyses
• Chapter 24 Software: ASSORT, iASSORT, Web Calculators, VECTrAK
• Appendix Astigmatic Terms and Concepts
• Financial Disclosures
• Index