Atlas of Refractive Surgery (Highlights of Ophthalmology : by Benjamin F. Boyd

By Benjamin F. Boyd

This atlas is an all-encompassing cutting-edge presentation of the several concepts in refractive surgical procedure and the techniques of selection for every refractive mistakes. all of the significant advancements are generally illustrated, essentially defined, and aim.

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Be very cautious with those close to presbyopia. They often have the impression that they will never need spectacles again. They should accept the possibility of having a period of temporary hyperopia, which may require either temporary or permanent reading glasses. Myopes are used to reading without spectacles. If this is no longer possible following refractive surgery, they may be unhappy with what the surgeon might consider a perfect result. Subjects 6 7 8 9 10 Factors Affecting the Surgeon's Choice of Operation In Chapter 2, we identified each of the procedures and discussed their indications, advantages, limitations and disadvantages.

The surgeon should not create a deeper ablation than that permitted by this “law”, simply in an attempt to obtain more correction. If he/she does, it may lead to risks, particularly ectasia and keratoconus. How to Calculate the Correct Amount of Ablation If, for example, the central cornea has a total thickness of 560 microns, as shown in Fig. 28, and the thickness of the corneal flap in LASIK is 160 microns, and we allow 10 microns for Descemet’s and the endothelium, there is a remaining stromal thickness of 390 microns.

These maps have become the practice standard because they present videokeratoscopic information in a form that is easy to use. Figure 35: The Computerized Videokeratoscope This state of the art equipment combines a series of illuminated rings, a digital camera, and a computer. The rings are reflected from a normal cornea as circular and equally spaced, as shown in Figs. 30 and 31. This image of the Placido disk rings is digitized by the computer shown in this figure and viewed by the physician on the computer monitor as a digitized color corneal map - a practical and clinically interpretable system.

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