Ectatic disorders associated with a claw-shaped pattern on corneal topography.
OBJECTIVE
To identify clinical findings associated with claw-shaped patterns on corneal topography.


METHODS
Retrospective, observational case series.


METHODS
Forty eyes (26 patients) with classic claw-shaped patterns on corneal topography were identified from 3,993 Orbscan II records. They were subclassified into three groups: Group 1 (pellucid marginal degeneration [PMD] or PMD suspect); group 2 (keratoconus or keratoconus suspect); and group 3 (ectasia). The refractive and topographic indices of groups 1 and 2 were compared.


RESULTS
There were nine eyes (six patients) in group 1, 27 eyes (18 patients) in group 2, and four eyes (two patients) in group 3. The mean radii of maximal anterior (2.96 mm) and posterior (3.06 mm) elevation in group 1 were significantly greater than those of group 2 (1.89 mm; P = .018 and 1.72 mm; P = .022, respectively).


CONCLUSIONS
The claw-shaped pattern on corneal topography is not diagnostic of PMD; it is also seen in keratoconus.
Lee
Brandon W
BW
Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts, USA.
Jurkunas
Ula V
UV
Harissi-Dagher
Mona
M
Poothullil
Antony M
AM
Tobaigy
Faisal M
FM
Azar
Dimitri T
DT
D003315:Cornea / Q000473:pathology*; D003317:Corneal Dystrophies, Hereditary / Q000175:diagnosis*; D019781:Corneal Topography; D004108:Dilatation, Pathologic / Q000175:diagnosis; D006801:Humans; D007640:Keratoconus / Q000175:diagnosis*; D012189:Retrospective Studies