By American Academy of Ophthalmology, M. Bowes Hamill MD
Significant revision for 2014-2015!
Covers the technological know-how of refractive surgical procedure, accommodative and nonaccommodative remedy of presbyopia, and sufferer overview. Examines particular tactics in refractive surgical procedure and their power issues, in addition to refractive surgical procedure in ocular and systemic ailment. This year's significant revision positive factors new pix and up to date info on lens implants utilized in the U.S. and different countries.
Upon of completion of part thirteen, readers might be capable to:
Identify the overall kinds of lasers utilized in refractive surgeries
Explain the stairs together with scientific and social heritage, ocular exam and ancillary checking out in comparing even if a sufferer is a suitable candidate for refractive surgery
For incisional keratorefractive surgical procedure, describe the heritage, sufferer choice, surgical recommendations, results, and complications
Explain fresh advancements within the software of wavefront know-how to floor ablation and LASIK
Describe the differing kinds of IOLs used for refractive correction
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Additional resources for 2014-2015 Basic and Clinical Science Course (BCSC): Section 13: Refractive Surgery
Different options for corneal imaging. All images are of the same patient taken at the same visit. A, Placido disk-based corneal curvature map showing axial and tangential curvature maps as well as the elevation map and the Placido rings image. Recall that this mapping technology analyzes only the surface characteristics of the cornea. B, Optical coherence tomography (OCT) image of the same cornea shown in A. Note that the corneal thickness profile (of the stroma as well as the epithelium) is well demonstrated, but the overall surface curvature is not.
D, Wavescan image from a device like that illustrated in Fig 1-1 A, taken of the fellow eye to that represented in A, B, and C. Note that this map does not show any corneal surface contours or features but rather provides information about the optics of the entire ocular system . As such, it can provide information on the refractive error and aberrations of the entire eye. (Images courtesy of M. ) . 22 • Refractive Surgery plane such as the iris plane; however, in order to be clinically useful, corneal surface maps are plotted to show differences from best-fit spheres or other objects that closely mimic the normal corneal shape (Fig 1-13).
1996; 22(5):624-629. 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 .
2014-2015 Basic and Clinical Science Course (BCSC): Section 13: Refractive Surgery by American Academy of Ophthalmology, M. Bowes Hamill MD