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Shin Hatou, Shigeto Shimmura, Jun Shimazaki, Tomohiko Usui, Shiro Amano, Hideaki Yokogawa, Akira Kobayashi, Xiaodong Zheng, Atsushi Shiraishi, Yuichi Ohashi, Tsutomu Inatomi, Kazuo Tsubota; Mathematical Projection Model of Visual Loss Due to Fuchs Corneal Dystrophy. Invest. Ophthalmol. Vis. Sci. 2011;52(11):7888-7893. doi: 10.1167/iovs.11-8040.
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To devise a mathematical disease classification model for eyes with primary guttata cornea, on the bases of endothelial loss trajectory and probability of advanced disease.
A series of 1971 patients (3281 eyes), some with and some without guttata corneas, undergoing specular microscopy were retrospectively reviewed. The eyes were classified into four stages; stage 0, without guttae; 1, guttata cornea without edema; 2, mild Fuchs' corneal dystrophy (FCD); and 3, severe FCD, according to clinical records, and patient age and corneal endothelial cell density (ECD) were plotted. Nonparametric density smoothing was used to create a contour map, and a best-fit curve for ECD loss was calculated. The relation between ECD decrease rate and the stages were evaluated.
Endothelial decrease rate in stage 0 was 0.44%/year, which was compatible with that of normal eyes reported in previous studies. Decrease rates of stages 1, 2, and 3 were 0.81%, 2.65%, and 3.08%/ year, respectively. The age-ECD loss curves of 1.40%/year (ECO1.4) and 2.00%/year (ECO2.0) further divided stage 1 into three subgroups; stage 1a, asymptomatic guttata cornea; 1b, borderline guttata cornea; and 1c, pre-FCD. The ECO2.0 cutoff line differentiated eyes with FCD from those without edema with a sensitivity and specificity of >90%. Stage 1c eyes were below ECO2.0 and had a decrease rate as high as FCD.
This mathematical model can be used to predict the prognosis of patients with primary guttata cornea.
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