Keratoconus
Symptoms & Signs
This condition causes decreased visual acuity. The earliest symptom is subtle blurring of vision that cannot be corrected with glasses. (Vision can generally be corrected to 20/20 with gas-permeable contact lenses.)
Diagnosis & Tests
Keratoconus is frequently discovered during adolescence. It can usually be diagnosed with slit-lamp examination of the cornea. Early cases may require a test called corneal topography, which creates a map of the curvature of the cornea.
When keratoconus is advanced, the cornea may be thinner in areas. This can be measured with a painless test called pachymetry.
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