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 evaluate. Examines particular strategies in refractive surgical procedure and their power issues, in addition to refractive surgical procedure in ocular and systemic affliction. This year's significant revision beneficial properties new pics and up-to-date details on lens implants utilized in the us 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 scientific and social heritage, ocular exam and ancillary trying 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 options, results, and complications
Explain contemporary 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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Extra info for 2014-2015 Basic and Clinical Science Course (BCSC): Section 13: Refractive Surgery
Alloplastic Material Addition Techniques The shape of the cornea can be altered by adding alloplastic material such as hydrogel on the surface or into the corneal stroma to modify the anterior shape or refractive index of the cornea. For example, the 2 arc segments of an intrastromal corneal ring can be placed in 2 pockets of the stroma to directly reshape the surface contour according to the profile of the individual rings (Fig 1-18). For further discussion, see Chapter 4. Collagen Shrinkage Techniques Alteration in corneal biomechanics can also be achieved by collagen shrinkage.
5 D Color Steps "' ... Axial Power Figure 1-15 Topographic maps showing small optical zone after excimer laser ablation (A) and decentered ablation (B). /Courtesy of J. ) The Role of Corneal Topography in Refractive Surgery Corneal topography is one of the key evaluative technologies in refractive surgery, crucial not only in preoperative screening but also in postoperative evaluation of patients with unexpected results. Topographic analysis should be undertaken in all patients being considered for refractive surgery in order to identify patients who should not undergo the procedure.
06 1 )lO D Range ·9,32 to -2-16 Dloplenl Trero11 020052 003032@ 21 · o01530 o ss~ 002297@ 96' ..... :10852@ 79• 0058-420255' 002B7B0 64° -000239 2"40 ' 1 I I 1 270 1 , 1 \ 300 Grid gpacing: 1 nm Zu 0015990 49• z. z.. 002852@ 54• 002631 G 10• Figure 1-12 (continued) C, Corneal tomography image using dual Scheimpflug/Placido-based technology of the same patient and eye shown in A and B. The surface curvature, pachymetry, and anterior and posterior elevation mappings are demonstrated.