Bilateral circumscribed posterior Keratoconus in Microcornea
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Posterior keratoconus is a rare ectatic corneal disorder characterized by non-inflammatory thinning of the cornea. It is usually a developmental disorder but some case reports have mentioned trauma as a possible cause of posterior keratoconus too. The thinning of the cornea leads to the characteristic cone-like protuberance of the posterior cornea. It is an unusual abnormality of the cornea generally classified as one of the anterior chamber cleavage anomalies. Posterior keratoconus can occur in two forms, generalized or localized, depending upon the curvature of the posterior cornea. The generalized posterior keratoconus also called as keratoconus posticus generalis, is characterized by a regular increase of the curvature of the entire posterior cornea.A case of bilateral circumscribed posterior keratoconus associated with unilateral irido-fundal coloboma presented to us with complaints of diminution of vision in both eyes since birth.

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