This paper documents a rare nonprogressive developmental disorderââ?¬â?bilateral circumscribed posterior keratoconusââ?¬â?in a 60-\r\nyear-old man referred for a cataract surgery. For the first time ultrasound biomicroscopy was used to visualise the local anterior\r\nbulging of the posterior corneal surface with concomitant thinning of the stroma. The amount of localized posterior depression,\r\ncorneal thickness and the refractive power of both the posterior and anterior corneal curvature were measured using slit-scanning\r\ntopography analysis (Orbscan).
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