By John Mountford Dip App Sc FCLSA FAAO, David Ruston BSc FRCOptom DCLP FAAO, Trusit Dave PhD MCOptom FAAO
This designated source demystifies the topic of orthokeratology and offers functional info for all these drawn to the method. serious, balanced, and informative, it completely evaluates the literature and proof, offers good guidance for perform, and lines a world strategy. this article is glossy, complete, and includes a wealth of colour illustrations.Features useful and finished details on Orthokeratology that won't to be had in different resourcesProvides a world method of the subjectThoroughly evaluates the entire to be had literature and evidenceOffers good guidance for perform for somebody considering utilizing OrthoK lensesDesigned in the event you desire to replace their wisdom relating Orthokeratology and who need a thorough, balanced view of the procedureWritten by means of overseas specialists within the box
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Additional info for Orthokeratology: Principles and Practice
Example text
Ophthalmic Optician: 1037-1040 Bibby M M (1976) Computer assisted photokeratoscopy and contact lens design. Optician 171(4423):37-44 Bland J M, Altman D G (1986) Statistical methods for assessing agreement between two methods of clinical measurement. Lancet 1: 307-310 Bogan S J, Waring I G 0, Ibrahim 0, Drews C, Curtis L (1990) Classification of normal corneal topography based on computer-assisted videokeratography. Archives of Ophthalmology 108: 945-949 Bonnet R, Cochet D (1962) New method of topographical ophthalmometry - its theoretical and clinical applications.
14, the tangential radius of curvature illustrates the localized curvature of the cornea in the meridional plane (the plane that contains the corneal point of interest and the videokeratoscope axis). 19 shows axial (sagittal) and tangential maps for a subject who has had a corneal graft. Currently, most topography devices have the facility to display sagittal and tangential maps. Tangential and axial maps assume that, during the alignment of the videokeratoscope, the normal to the corneal point of interest lies within the meridional plane.
35 36 ORTHOKERATOLOGY • Symmetric bowtie: this pattern represents regular astigmatism. For a pattern to be classified as a symmetric bowtie there must be a central constriction in the outline of the color zone from the color-coded contour maps. Bogan et al (1990) found a statistically significant difference in the level of astigmatism between symmetric bowtie patterns and the round or oval patterns. • Asymmetric bowtie: these patterns are very similar to symmetric bowtie patterns in that there is an area of constriction in the bowtie.