Keratoconus

This is a fairly common disorder in which the cornea progressively becomes thinner and assumes an irregular cone shape. The condition starts during the adolescent years and progresses slowly over time; after which (around middle age), it may become stationary already. Almost all cases are bilateral, but one eye is usually much more severely affected. 

Patients usually note progressive blurring of vision as their astigmatism and myopia increases. Some may report the need to change their glasses or contact lenses frequently. 

Early signs are only noted by the ophthalmologist using a slitlamp biomicroscope and by corneal topography. 

Advanced signs include Munson's signs (bulging of the lower lid when the patient looks down), corneal scarring (opacity). 

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