Cornea plana is a rare disease in which the cornea is flattened with a low refractive power. In addition to these features, hypermetropia, deep central corneal opacities, hazy corneal limbus, peripheral scleralization of the cornea and early arcus senilis can also be seen. Closed-angle glaucoma may occur as a result of shallow anterior chamber and narrow angle; however, open-angle glaucoma has also been reported in these patients. Measuring the real intraocular pressure (IOP) value of such eyes is difficult since tonometers are affected by corneal curvature. Therefore, the diagnosis of glaucoma may be delayed for a long time. In this case report we aimed to present a case of cornea plana with early open-angle glaucoma and to investigate which tonometer was appropriate for measuring the correct IOP value in such eyes.
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