Corneal topography in clinical practice (Pentacam system) : by Mazen M., M.D., Ph.D. Sinjab

By Mazen M., M.D., Ph.D. Sinjab

Corneal topography is a non-invasive clinical imaging approach 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 digital camera to create a 3D snapshot of the anterior of the attention. This moment version has been totally up to date to supply the newest advancements in corneal topography and tomography utilizing the Pentacam desktop. starting with an creation, the next sections describe the basics of corneal topography and use of the Pentacam with assorted ophthalmic problems. With approximately 250 top of the range, color photos and illustrations, this concise consultant is principally valuable to graduate and postgraduate scholars in studying the best way to learn and interpret corneal topography.

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The cystic spaces coalesce to form a labyrinth of tunnels separated by pillars of Muller (glial) cells. On occasion, the inner walls may rupture, giving way to retinal excavations that are unrelated to vitreous base excavations. This cystoid excavation can be mistaken for a retinal hole, but it is usually not a complete hole because there is still some intact retinal tissue at its base-. Retinal detachments rarely occur around these pseudoretinal holes. The remaining Muller cells are responsible for the stippled appearance of the inner retinal surface in typical cystoid degeneration.

Zonular traction tufts are larger and longer than the cystic and noncystic retinal tufts, and, in contrast to these other tufts, retinal breaks may occur at the base of the tuft. The incidence of zonular traction tufts is 16 %, and is bilateral in 11 % of cases. About 66 % of affected eyes have one zonular traction tuft per eye, and the remaining 34 % of cases have multiple tufts per eye. Zonular traction tufts have a predilection for the inferonasal quadrant. Ora Serrata Pearls Ora serrata pearls are pinpoint-sized, round, glistening, yellow-white, sometimes calcified structures located on dentate processes, the pars plana, or on peripheral retina near the ora serrata region.

There is a predilection for the inferotemporal quadrant. In some individuals, reticular cystoid degeneration may be the precursor lesion of reticular degenerative retinoschisis. Acquired Typical Degenerative Retinoschisis Typical degenerative retinoschisis consists of a split in the neurosensory retina, usually at the outer plexiform layer, that is greater than one disc diameter in area. Characteristically, there is tissue loss in the middle layers of the neurosensory retina with disruption of Muller cells (radial pillars), resulting in a round or oval lesion in which the inner portion of the retina is elevated and has a smooth dome-shaped appearance.

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