Corneal structural and morphologic distortion of any degree usually has a negative impact on quality of vision, and patients can often become symptomatic even at an early stage.
Corneal ectatic disorders cause visual distortion and erode visual quality, the extent of which depends on the degree of corneal ectasia (mild, moderate or severe).
These disorders are usually noninflammatory, bilateral corneal thinning that may be focal or diffuse, with secondary corneal ectasia involving the central, paracentral or peripheral cornea. They encompass keratoconus, keratoglobus, pellucid marginal
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