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 review. Examines particular methods in refractive surgical procedure and their power issues, in addition to refractive surgical procedure in ocular and systemic disorder. This year's significant revision gains new portraits and up to date info on lens implants utilized in the USA and different countries.
Upon crowning glory of part thirteen, readers might be capable to:
Identify the final forms of lasers utilized in refractive surgeries
Explain the stairs together with scientific and social historical past, ocular exam and ancillary checking out in comparing no matter if a sufferer is a suitable candidate for refractive surgery
For incisional keratorefractive surgical procedure, describe the heritage, sufferer choice, surgical thoughts, results, and complications
Explain contemporary advancements within the software of wavefront expertise to floor ablation and LASIK
Describe the differing kinds of IOLs used for refractive correction
Read 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
I#m~ r ~! ,,'F:! ,. 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.
000, divided by this tangentially determined radius. A tangential map typically shows better sensitivity to peripheral changes with less "smoothing" of the curvature than an axial map shows (see Fig 1-9). In these maps, diopters are relative units of curvature and are not the equivalent of diopters of corneal power. The potential benefit of this method's increased sensitivity is balanced by its tendency to document excessive detail ("noise"), which may not be clinically relevant. For routine refractive screening, most surgeons have the topographic output in the axial (sagittal) curvature mode rather than the instantaneous (tangential) mode.
The lamellae are initially held in position by negative stromal pressure generated by the endothelial cells aided by an intact epithelial surface. Even years after treatment, the lamellar interface can be broken and the flap lifted, indicating that only a minimal amount of healing occurs. LASIK flaps can also be dislodged secondary to trauma many years postoperatively. Dupps WJ Jr, Wilson SE. Biomechanics and wound healing in the cornea. Exp Eye Res. 2006;83( 4):709-720. Netto MV, Mohan RR, Sinha S, Sharma A, Dupps W, Wilson SE.