| Autor: |
Tombran-Tink, Joyce, Barnstable, Colin J., Rizzo, Joseph F., Alió, Jorge L., Shabayek, Mohamed H., Artola, Alberto, El Saftawy, Hany |
| Zdroj: |
Visual Prosthesis & Ophthalmic Devices; 2007, p211-219, 9p |
| Abstrakt: |
Pellucid marginal corneal degeneration (PMCD) is a noninflammatory ectatic corneal disorder mostly involving the inferior half of the cornea in a crescentic fashion (Fig. 1). It is a bilateral disease, although one eye may be affected earlier and clinically diagnosed, while the other eye has no clinical features (1). Although classically described as an inferor entity, the site of involvement can be in any quadrant of the cornea, including the superior part, which is termed superior PMCD (2,3). The degeneration is distinguished from other ectatic corneal disorders by its characteristic location and the absence of inflammatory signs. Typically the thinning extends from the 4-o'clock position to the 8-o'clock position, 1 mm from the limbus with intact epithelium and normal corneal thickness superiorly. The area between the limbus and thinning is clear, without scarring, lipid deposition, or vascularization. Usually, present with reduced visual acuity owing to high irregular astigmatism in the fourth to fifth decades of life (4). [ABSTRACT FROM AUTHOR] |
| Databáze: |
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