3/31/2023 0 Comments Pellucid topography![]() 5 We, again, would urge the use of a full limbal-to-limbal corneal thickness map to augment other clinical measurements to properly diagnose true PMD. 1: Topographic maps of case 1, nonprogressive pellucid-like. 5 The distinction is not just of academic interest, as treatments such as CXL, intrastromal corneal ring segments, or deep anterior lamellar keratoplasty, which may be appropriate for the more common inferior KCN, would not only be more difficult to perform but may have very different outcomes in true PMD, in which the pathology typically extends past the areas of treatment offered by these modalities. Periodic eye examinations including corneal topography was recommended for this eye. Corneal topography closed the diagnosis of Pellucid Marginal. Both inferior keratoconus and PMD are noninflammatory corneal thinning ectatic diseases, but it is important to accurately distinguish these 2 conditions considering the prognosis and overall clinical differences. Corneal topography shows the typical butterfly pattern of an irregular astigmatism with a marked flattening along a vertical axis and a steepening of the. Slit-lamp exam showed an inferior corneal thinning in both eyes, accentuated in the right eye. The vertical Scheimpflug image, however, between these two conditions can be remarkably similar and would fail to differentiate true PMD from inferior keratoconus ( Figure 1). 1 in their article acknowledge the limitations of relying solely on curvature patterns and add a comparison of the superior with inferior corneal thickness taken from the vertical Scheimpflug image. Topographic analysis in pellucid marginal corneal degeneration and keratoglobus. 3,4 Our previous work suggested that a full pachymetric map is a more definitive method to differentiate PMD from inferior keratoconus. Corneal topography suggested that in the second patient, PMCD may have. Crab claw pattern on corneal topography: pellucid marginal degeneration or inferior keratoconus Eye (Lond). The ectatic zone, which is 1-2 mm from the limbus, lies above the point of the maximum corneal thinning. It is characterized by a peripheral crescentic band of thinning, usually in the inferior cornea. Crab-claw patterns on curvature maps are a pattern also seen in the much more common inferior keratoconus. Pellucid marginal corneal degeneration (PMCD) is a bilateral, noninflammatory, peripheral corneal thinning disease. Both of these articles use similar criteria to define PMD, namely inferior corneal thinning and a crab-claw pattern on anterior curvature topography. 2 appeared concurrently in another journal describing the positive results of transepithelial phototherapeutic keratectomy followed by CXL in PMD. 1 advocates for the use of corneal crosslinking (CXL) as a potential treatment of pellucid marginal degeneration (PMD). ![]()
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