All the following are signs of keratoconus, except:

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Keratoconus is characterized by progressive thinning and conical protrusion of the cornea, leading to visual impairment. The thickening of the central cornea is not a sign of keratoconus; instead, corneal thinning, especially in the inferior cornea, is a hallmark of the condition. Munson sign (bulging of the lower eyelid on downgaze) and prominent corneal nerves are also associated with keratoconus.

All the Following Are Signs of Keratoconus, Except