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 evaluate. Examines particular approaches in refractive surgical procedure and their power problems, in addition to refractive surgical procedure in ocular and systemic affliction. This year's significant revision positive factors new photos and up-to-date details on lens implants utilized in the us and different countries.
Upon final touch of part thirteen, readers may 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 an acceptable candidate for refractive surgery
For incisional keratorefractive surgical procedure, describe the historical past, 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 Online or Download 2014-2015 Basic and Clinical Science Course (BCSC): Section 13: Refractive Surgery PDF
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Additional info for 2014-2015 Basic and Clinical Science Course (BCSC): Section 13: Refractive Surgery
Limitations of corneal topography In addition to the limitations of the specific algorithms and the variations in terminology among manufacturers, the accuracy of corneal topography may be affected by other potential problems: • tear-film effects • misalignment (misaligned corneal topography may give a false impression of corneal apex decentration suggestive ofkeratoconus) • instability (test-to-test variation) • insensitivity to focus errors • limited area of coverage (central and limbal) • decreased accuracy of corneal power simulation measurements (SIM K) after refractive surgical procedures • decreased accuracy of posterior surface elevation values in the presence of corneal opacities or, often, after refractive surgery (with scanning-slit technology) Roberts C.
Current clinical practice typically involves discontinuing use of soft contact lenses for at least 3 days to 2 weeks (toric lenses may require longer) and of rigid contact lenses for at least 2- 3 weeks. ome urgeon keep patients out of rigid contact lenses for 1 month for every decade of contact lens wear. Patients with irregular or unstable corneas should discontinue wearing theiJ contact len es for a longer period and then be re-refracted every few weeks until the refraction and c0rneal topography tabilize before being considered for refractive surgery.
00, 150, , .. 1BO- ...... ', •,... o to +19,4 mlcrom. CIO , , t LOQ 1 ...... ....... ...... .... 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.