By Benjamin F. Boyd
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Extra info for Atlas of Refractive Surgery
This is related to the type of microkeratome used. The “B” zone shows the depth of tissue ablated from the stroma. This is varies with the amount of myopic correction the surgeon needs to attain and the type of excimer laser system utilized. 00 D of myopia with a stromal ablation of 80 microns. The “C” zone shows the amount of remaining corneal tissue not treated during the excimer laser procedure. In this particular case it amounts to 320 microns. It is important to assess these measurements in detail and to keep in mind that the recommended remaining corneal tissue in every case should be at least 250 microns, to avoid complications like postoperative corneal ectasia.
Emphasizes that, after about a hundred years of development, refractive surgery is now a legitimate subspecialty of ophthalmology. There are now refractive surgery specialty societies and congresses. Journals and a significant number of papers on the subject appear in the major ophthalmology journals around the world. Refractive surgery in the 21st century requires that the surgeon develop multiple skills. A good cataract surgeon should have a variety of skills and techniques, including the ability to employ a variety of intraocular lenses where they are needed.
C) Overcorrection after LASIK or PRK 4) Excimer Laser Sculpting to Produce a Multifocal Cornea - (Fig. 23-E) Indications: Simultaneously performed for correction of refractive error for distance and near (presbyopia) (Fig. 19). Presumably this is a custom-made ablation for each different cornea and refractive error. It works in some cases, but it is still quite risky in most patients because they may end up with decreased quality and comfort of vision. Changing the Corneal Curvature with Surgical Instruments 1) Radial Keratotomy - (Fig.