By Mazen M., M.D., Ph.D. Sinjab
Corneal topography is a non-invasive scientific imaging procedure for mapping the outside curvature of the cornea, the outer constitution of the attention. This technique will be performed with a Pentacam, which makes use of a rotating digicam to create a 3D photo of the anterior of the attention. This moment variation has been totally up to date to supply the most recent advancements in corneal topography and tomography utilizing the Pentacam computer. starting with an advent, the next sections describe the basics of corneal topography and use of the Pentacam with varied ophthalmic issues. With approximately 250 prime quality, color photos and illustrations, this concise advisor is principally beneficial to graduate and postgraduate scholars in studying the right way to learn and interpret corneal topography.
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Extra resources for Corneal Topography in Clinical Practice
It can be considered a vertical or oblique type of pattern 12. 28A and B). 29). 30A to D). This is an indicator of corneal instability, and it may precede KC (notice the vortex distribution of the red and blue lines). S. The most concerning are steep K-readings, inferior-superior asymmetry and skewing of the steep axis. Important Figures • It was previously recommended—when taking the decision—that maximal K readings (K-max) should not be more than 47 D on the front sagittal curvature map. Recently, with the availability of thin flap technology, the power 49 D became acceptable.
In spite of this fact, all topographic systems adopt the VK normal or it is similar in principle, considering that the three axes are identical. This misconception leads to invalidity of curvature maps due to misalignment during taking the capture. This leads, of course, to wrong diagnosis and wrong decision of treatment. Misalignment patterns and their effects will be discussed in chapter 15 in details. Patterns of Corneal Curvature The Normal Cornea When considering the topography of a normal cornea, it is necessary to remember that there is a wide spectrum of normality.
Notice the appearance of the cone when elevations are related to the modified red body rather than the yellow one. Obviously, the cone will be more clearly displayed. 13: The principle of the enhanced spherical reference body. S. 1: The computer adjusts the radius of the reference body automatically depending on the mean central radii, but it can be adjusted and modified manually, the topography will differ accordingly. S. 2: The Pentacam system is useful in precise specification of the center of the cornea, whereas Placido system is more accurate in specifying corneal periphery.