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 assessment. Examines particular techniques in refractive surgical procedure and their power problems, in addition to refractive surgical procedure in ocular and systemic ailment. This year's significant revision beneficial properties new pix and up-to-date details on lens implants utilized in the U.S. and different countries.
Upon of entirety of part thirteen, readers might be capable to:
Identify the overall different types of lasers utilized in refractive surgeries
Explain the stairs together with clinical and social heritage, ocular exam and ancillary checking out in comparing even if a sufferer is an acceptable candidate for refractive surgery
For incisional keratorefractive surgical procedure, describe the background, sufferer choice, surgical ideas, results, and complications
Explain fresh advancements within the program 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
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. Irregular astigmatism is nonuniform corneal steepening from a variety of causes that cannot be corrected by cylindrical lenses.
Axial power and curvature Axial power representation comes from the supposition that the cornea is a sphere and that the angle of incidence of the instrument is normal to the cornea. Axial power is based on the concept of "axial distance" (Fig 1-8). ites flatter curvatures. 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.
Solid-state lasers have been designed to generate wavelengths of light near 193 nm without the need to use toxic gas, but the technical difficulties in manufacturing these lasers have limited their clinical use. The femtosecond laser is approved by the US Food and Drug Administration (FDA) for creating corneal flaps for LASIK and may also be used to create channels for 7 p CHAPTER 1: The Science of Refractive Surgery • 29 intrastromal ring segments and for lamellar keratoplasty and PKP. It uses a 1053-nm infrared beam that causes photodisruption, a process by which tissue is transformed into plasma, and the subsequent high pressure and temperature generated lead to rapid tissue expansion and formation of microscopic cavities within the corneal stroma.