Advanced Corneal Imaging and Interpretation in the
Diagnosis and Treatment of Corneal Disease
The normal human eye encounters optical defects called “wavefront
aberrations” which include both lower (defocus and astigmatism) and
higher order aberrations. The irregular eye suffering from ectatic
disease for example has some variation in the pattern and magnitude
of these wavefront aberrations. Wavefront sensing and topography
techniques measure the optical quality of the eye and aid in the
differential diagnosis and in the eventual management of these
abnormal conditions across the severity spectrum, from preclinical to
advanced stages.
This course will review wavefront aberrometry, corneal topography,
and other modern imaging technologies including optical coherence
tomography in the Optometric practice setting. It will explain the
clinical relevance of such imaging data with corresponding case studies
demonstrating how imaging may be used to improve visual outcomes.
Objectives:
 Basic Concepts of Wavefront Sensing
 Measuring wavefront aberration in the human eye
 Terminology and techniques
 Principles of ophthalmic wavefront sensing techniques
 Hartmann-Shack
 Moire
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Basic Concepts of Corneal Topography
Placido & Slit-Scanning technology
Understanding elevation versus curvature topography
Topography = the “Corneal wavefront”
 Correlating corneal vs ocular wavefront
Pachymetry derivation
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Ancillary Imaging Technology
Optical Coherence Tomography
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Differential Diagnosis of Reduced Image Quality
Wavefront aberration in the “normal” human population
Wavefront aberration in the “abnormal” human population
 Keratoconus
 Pellucid marginal degeneration
 Post-refractive surgery, Post-orthokeratology
 Unexplained reduced visual acuity
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Poor night vision
High ametropia
Case Studies
 Visual impact of rigid gas permeable lens fitting
 Visual impact of hydrogel/SiH lens fitting
 Visual impact of corneal surgery