By Brian S. Boxer Wachler
This can be the a lot wanted consultant for ophthalmologists and sufferers who are looking to deal with and comprehend approximately keratoconus a noninflammatory, degenerative sickness that compromises the structural integrity of the collagen matrix in the corneal stroma. The hallmark attribute is the improvement of a localized, cone-shaped estasia, bulge or hernia that's observed through thinning of the stroma within the zone of the cone.
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Additional resources for Modern Management of Keratoconus
Placido surface topography was not possible due to very severe irregularity and scarring compromising the corneal reflex, but Pentacam tomography was possible due to the Scheimpflug slit projection photography. More than 70 D of curvature was noted in both eyes with more than 7 D of delta simulated keratometry (Figure 2-17). Corneal thickness profiles were typical of severe thinning in both eyes (Figure 2-18), and Scheimpflug image also demonstrated the same (Figure 2-19). ORA results are listed in Table 2-4.
A typical response waveform. In- and outgoing applanation events are indicated by the two peak intensities of a 3-mm infrared beam reflected off the central cornea, and the air pressures intersecting these two applanation events are recorded as P1 (ingoing) and P2 (outgoing). Corneal hysteresis is simply the difference between the in- and outgoing applanation pressures (P1– P2). The corneal resistance factor (CRF) is derived from the same dual-applanation signal and is proposed to be a measure of the elastic resistance of the cornea.
21. 22. 23. 24. 25. 26. 27. 28. 29. 30. Maurice DM. The cornea and sclera. In: Davson H, ed. The Eye. Vol. 1B: Vegetative Physiology and Biochemistry. Orlando, FL: Academic Press; 1984. Polack FM. Morphology of the cornea. I. Study with silver stains. Am J Ophthalmol. 1961;51:1051-1056. Smolek MK, McCarey BE. Interlamellar adhesive strength in human eyebank corneas. Invest Ophthalmol Vis Sci. 1990;31(6):1087-1095. Ehlers N. Studies on the hydration of the cornea with special reference to the acid hydration.
Modern Management of Keratoconus by Brian S. Boxer Wachler