By American Academy of Ophthalmology, M. Bowes Hamill MD
Significant revision for 2014-2015!
Covers the technology of refractive surgical procedure, accommodative and nonaccommodative remedy of presbyopia, and sufferer overview. Examines particular strategies in refractive surgical procedure and their capability problems, in addition to refractive surgical procedure in ocular and systemic affliction. This year's significant revision positive factors new pics and up-to-date details on lens implants utilized in the us and different countries.
Upon final touch of part thirteen, readers will be capable to:
Identify the final different types of lasers utilized in refractive surgeries
Explain the stairs together with clinical and social heritage, ocular exam and ancillary trying out in comparing no matter if a sufferer is a suitable candidate for refractive surgery
For incisional keratorefractive surgical procedure, describe the background, sufferer choice, surgical strategies, results, and complications
Explain contemporary advancements within the program of wavefront know-how to floor ablation and LASIK
Describe the differing kinds of IOLs used for refractive correction
Read Online or Download 2014-2015 Basic and Clinical Science Course (BCSC): Section 13: Refractive Surgery PDF
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Additional resources for 2014-2015 Basic and Clinical Science Course (BCSC): Section 13: Refractive Surgery
Corneal Tomography Whereas surface corneal curvature (power) is best expressed by Placido imaging, overall corneal shape, including spatial thickness profiles, is best expressed by computed tomography. A variety of imaging systems are available that take multiple slit images and reconstruct them into a corneal-shape profile, including anterior and posterior corneal elevation data. These include scanning-slit technology and Scheimpflug-based imaging systems (Fig 1-12). To represent shape directly, color maps may be used to display a z-height from an arbitrary .
Figure 1-13 r CHAPTER 1: The Science of Refractive Surgery • 23 because the abnormal cornea has an unpredictable response and/or progressive ectasia. Forme fruste, or subclinical, keratoconus typically is considered a contraindication to ablative refractive surgery. Studies are under way to determine the suitability of some keratorefractive procedures in combination with corneal collagen crosslinking as alternative therapeutic modalities for these patients (see also Chapter 7). Corneal topography and tomography can also be used to demonstrate the effects of keratorefractive procedures.
This representation also is extremely dependent on the reference axis employed-optical or visual. ooco Figure 1-7 Placido imaging of the cornea. A, The raw Placido disk image; B, computergenerated color map derived from data in A. /Courtesy o f J. Bradley Randleman, MD.! 16 • Refractive Surgery Figure 1-8 Schematic representa tion of the difference between axial distance (axi al curvature) and radius of curvatu re for 2 points on a curved surface. Points C1 and C2 represent the centers of curvature of their respective surface points.