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 therapy 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 beneficial properties new portraits and up-to-date details on lens implants utilized in the USA and different countries.
Upon crowning glory of part thirteen, readers could be capable to:
Identify the final varieties of lasers utilized in refractive surgeries
Explain the stairs together with scientific and social historical past, ocular exam and ancillary trying out in comparing no matter if a sufferer is an acceptable candidate for refractive surgery
For incisional keratorefractive surgical procedure, describe the heritage, sufferer choice, surgical innovations, results, and complications
Explain fresh advancements within the program of wavefront know-how to floor ablation and LASIK
Describe the different sorts 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
Prolate corneas minimize spherical aberrations by virtue of their relatively flat peripheral curve. Conversely, oblate corneal contours, in which the peripheral cornea is steeper than the center, increase the probability of having induced spherical aberrations. After conventional refractive surgery for myopia, with the CHAPTER 1: The Science of Refractive Surgery • 15 resulting flattening of the corneal center, corneal asphericity increases in the oblate direction, which may cause degradation of the optics of the eye.
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.
60 D O' Meridian. Radius: 315 / 105 B 60 ,. 00 90 • The Science of Refractive Surgery 4S 150, ~ Max Min· - ~ , 15 ... 0D 69 .... --- ... Axi!. 59 mm Kappe. 56. 09 , --- 21 l 225 270 Power. Meridian~ 44 600 Radius: 0,0mm o• OS Figure 1-9 Examples of curvature maps. A, Axial (sag ittal); B, instantaneous (tangential). (Courtesv of J. ) Placido-based imaging; that is, because the Placido image cannot detect curvature at the central measurement point, the corneal meridional steepening seems to disappear centrally and become enhanced as the imaging moves farther from center.