Cataract and Refractive Surgery by Robert J. Cionni MD (auth.), Thomas Kohnen, Douglas D. Koch

By Robert J. Cionni MD (auth.), Thomas Kohnen, Douglas D. Koch MD (eds.)

Te sequence necessities in Ophthalmology was once initi- to debate clinically appropriate and applicable t- ated years in the past to expedite the well timed trans- ics. Summaries of clinically proper details fer of recent details in imaginative and prescient technology and feature been supplied all through each one bankruptcy. evidence-based medication into medical perform. each one subspecialty sector now has been lined We inspiration that this prospicient thought will be as soon as, and the reaction to the frst 8 volumes moved and guided by means of a resolute dedication within the sequence has been enthusiastically confident. to excellence. it truly is moderate to now replace our With the beginning of the second one cycle of subspecialty readers with what has been completed. assurance, the dissemination of sensible informa- Te rapid target was once to move informa- tion should be persisted as we research extra approximately tion via a top quality quarterly booklet the rising advances in quite a few ophthalmic within which ophthalmology will be represented through subspecialties that may be utilized to procure the 8 subspecialties. during this regard, every one factor has absolute best care of our sufferers. in addition, we had a subspecialty subject and has been overseen will proceed to spotlight clinically correct - by way of the world over famous quantity edi- formation and retain our dedication to - tors, who in flip have invited a bevy of specialists cellence. G. okay. Krieglstein R. N.

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Logically, if the crystalline lens was decentered prior to surgery, one may expect that an artificial lens, placed within the same bag, will also be displaced. Suture fixation of the CTR to the scleral wall may provide the necessary lateral support for the bag. Osher presented in 1997 the “synthetic zonule” (Video Journal of Cataract Implant Surgery 8 [8]) and Assia developed a technique to suture a CTR through the capsule in a relatively closed system (ASCRS meeting 1996, Seattle, WA, USA). However, the sharp needle and the thin suture may “cheese wire” the posterior capsule and the break may extend posteriorly and jeopardize IOL fixation.

Merriam JC, Zheng L. Iris hooks for phacoemulsification of the subluxated lens. J Cataract Refract Surg 1997;23(9):1295–1297. 15. Michaeli A, Assia EI. Scleral and iris fixation of posterior chamber lenses in the absence of capsular support. Curr Opin Ophthalmol 2005;16(1):57–60. 16. Moreno-Montanes J, Sainz C, Maldonado MJ. Intraoperative and postoperative complications of Cionni endocapsular ring implementation. J Cataract Refract Surg 2003;29(3):492–497. 17. Moreno-Montanes J, Heras H, Fernandez-Hortelano A.

1 Ultrasound Axial length has traditionally been measured using ultrasound biometry. When sound waves encounter an interface of differing densities, a fraction of the signal echoes back. Greater dif- 32 4 Advanced Intraocular Lens Power Calculations ferences in density produce a greater echo. By measuring the time required for a portion of the sound beam to return to the ultrasound probe, the distance can be calculated (d = v × t)/2. Because the human eye is composed of structures of varying densities (cornea, aqueous, lens, vitreous, retina, choroid, scleral, and orbital fat), the axial length of each structure can be indirectly measured using ultrasound.

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