By John Mountford Dip App Sc FCLSA FAAO, David Ruston BSc FRCOptom DCLP FAAO, Trusit Dave PhD MCOptom FAAO
This specific source demystifies the topic of orthokeratology and offers sensible info for all these drawn to the approach. serious, balanced, and informative, it completely evaluates the literature and facts, supplies good directions for perform, and contours a world procedure. this article is sleek, finished, and encompasses a wealth of colour illustrations.Features sensible and accomplished info on Orthokeratology that won't to be had in different resourcesProvides a global method of the subjectThoroughly evaluates all the to be had literature and evidenceOffers good guidance for perform for an individual considering utilizing OrthoK lensesDesigned should you desire to replace their wisdom bearing on Orthokeratology and who desire a thorough, balanced view of the procedureWritten through overseas specialists within the box
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Additional info for Orthokeratology: Principles and Practice
Algorithms used in the reconstruction of the corneal profile Having captured and digitized the reflected mire image, the corneal profile must be reconstructed. As described earlier, there are numerous difficulties in reconstructing a three-dimensional surface from a two-dimensional image but, by making certain assumptions, these difficulties may be overcome. In general, the following assumptions are made for the various reconstruction techniques: • The working distance from the target to the image is constant.
A common assumption made in some videokeratoscopes using concentric rings is that light commencing at one meridian from the object plane lies in the same meridian at the film plane. This does not apply to targets which consist of point sources, as each point can be easily located in the image plane, therefore any skewing of the image can be easily detected as the target is not continuous like a ring. Assuming that there is no meridional skew could lead to errors in the reconstruction of the corneal surface.
This classical model of the corneal contour was of a surface comprising two distinct zones - a central spherical area (known as the corneal cap) measuring 4-5 mm in diameter, and a peripheral zone that flattens progressively towards the limbus. The central zone is responsible for forming the fovea. More recently, the cornea has been described more specifically in terms of four anatomical zones (Waring 1969). These zones are the central, paracentral, peripheral, and limbal zones (Fig. 16). 16 is known as the geometric center.