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Dr Agarwals’ Step by Step Corneal Topography
Amar Agarwal, Athiya Agarwal, Sunita Agarwal
CHAPTER 1:
Fundamentals of Corneal Topography
INTRODUCTION: HUMAN OPTICS AND THE NORMAL CORNEA
INSTRUMENTS TO MEASURE THE CORNEAL SURFACE
Keratometry
Keratoscopy or Photokeratoscopy
Computerized Videokeratoscopy: Modern Corneal Topographers
UNDERSTANDING AND READING CORNEAL TOPOGRAPHY
Topographic Scales
Absolute, Standardized or International Standard Scale
Relative, Normalized or Adaptative Color Scale
Computer Displays: Presentation of Topographic Information
COMMON CORNEAL MAPS
SPECIAL SOFTWARE APPLICATIONS AND DISPLAYS
Multiple Display Option
Surgical Applications
Contact Lens Fitting Application
TOPOGRAPHY MAPS OF THE NORMAL CORNEA
Comparing Displays
CHAPTER 2:
Special Topographic Conditions
MAP OF A NORMAL ROUND CORNEA
NORMAL CORNEA WITH ASTIGMATISM ACCORDING TO THE RULE
TOPOGRAPHIC MAP OF ASTIGMATISM EXPRESSED IN HEIGHTS
KERATOCONUS
CORNEAL ULCER
MARGINAL PELLUCID DEGENERATION
CONTACT LENS OVERUSE (WARPAGE)
CURVED ARCUATE KERATOTOMIES (ASTIGMATIC KERATOTOMIES)
KERATOTOMY WITH RESULTING ECTASIA
PHOTOREFRACTIVE KERATECTOMY PRK
SUBTRACTION MAP IN A PRK
TRUE CURVATURE ANALYSIS IN PRE/POST PRK
PARACENTRAL ISLAND
EFFECT OF SUTURE REMOVAL AFTER KERATOPLASTY
SOFTWARE ADJUSTMENT OF A DECENTERED AXIS
MYOPIC AND HYPEROPIC KERATOMILEUSIS (LASIK)
INTRASTROMAL SEGMENTED GRAFT FOR THE CORRECTION OF HIGH MYOPIAS
FLUORESCEIN SIMULATION IN RGP CONTACT LENS
ACKNOWLEDGEMENTS
CHAPTER 3:
Orbscan
INTRODUCTION
OPTICS
Paraxial Optics
Raytrace or Geometric Optics
ELEVATION
ORBSCAN I AND II
SPECULAR VS BACKSCATTERED REFLECTION
Imaging in Orbscan
Map Colors Conventions
Analysis of the Normal Eye by the Orbscan Map
Clinical Applications
SUMMARY
CHAPTER 4:
The Orbscan IIz Diagnostic System and Swage Wavefront Analysis
INTRODUCTION
ORBSCAN
Quad Map
Power Maps
Pachymetry Map
Global Perspective
Posterior Corneal Elevation Maps
Preoperative LASIK Screening
Three Step Rule (Table 4.1)
Orbscan Risk of Ectasia Indices
Clinical Examples
ZYOPTIX
ACKNOWLEDGEMENT
CHAPTER 5:
Orbscan Corneal Mapping in Refractive Surgery
INTRODUCTION
ORBSCAN CORNEAL MAPPING FOR REFRACTIVE SURGERY DIAGNOSTICS
SELECTION CRITERIA
Power Maps
Posterior Elevation
Pachymetry
Composite/Integrated Information
Bent/warped Cornea
Correlation of Signs of the Highest Point on the Posterior Elevation
CHAPTER 6:
Anterior Keratoconus
INTRODUCTION
ORBSCAN
TECHNIQUE
Anterior Keratoconus
DISCUSSION
CONCLUSION
CHAPTER 7:
Posterior Corneal Changes in Refractive Surgery
INTRODUCTION
TOPOGRAPHY
ORBSCAN
PRIMARY POSTERIOR CORNEAL ELEVATION
Posterior Corneal Topography
Preexisting Posterior Corneal Abnormalities
Agarwal Criteria
IATROGENIC KERATECTASIA
EFFECT OF POSTERIOR CORNEAL CHANGE ON IOL CALCULATION
CHAPTER 8:
Topographic and Aberrometer Guided Laser
INTRODUCTION
ABERRATIONS
ZYOPTIX LASER
ORBSCAN
ABERROMETER
ZYLINK
RESULTS
DISCUSSION
CONCLUSION
CHAPTER 9:
Aberropia: A New Refractive Entity
INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
CONCLUSION
CHAPTER 10:
Corneal Ectasia Post-Lasik: The Orbscan Advantage
INTRODUCTION
CORNEAL ECTASIA
SELECTION CRITERIA
Pachymetry5
Posterior Elevation Map (Figure 10.4)
Power Map
Composite/Integrated Information
FUTURE THOUGHTS
ACKNOWLEDGEMENTS
CHAPTER 11:
Corneal Topography in Cataract Surgery
INTRODUCTION
CORNEA
KERATOMETRY
KERATOSCOPY
COMPUTERIZED VIDEOKERATOGRAPHY
ORBSCAN
NORMAL CORNEA
CATARACT SURGERY
EXTRACAPSULAR CATARACT EXTRACTION
INTRAOCULAR LENS
Non-Foldable IOL
Foldable IOL
ASTIGMATISM INCREASED
BASIC RULE
UNIQUE CASE
PHAKONIT
SUMMARY
CHAPTER 12:
Corneal Topography in Phakonit with a 5 mm Optic Rollable IOL
INTRODUCTION
ROLLABLE IOL
SURGICAL TECHNIQUE
Topographic Analysis and Astigmatism
Microphakonit (Cataract Surgery through a 0.7 mm Tip)
DISCUSSION
CONCLUSION
INDEX
TOC
Index
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