Keratoconus is the thinning of the cornea the clear dome-shaped outer surface of your eye. Eventually, the cornea bulges outward into a cone shape causing blurred vision, sensitivity to light and difficulty seeing at night. The chance of developing it increases if it runs in the family. Different treatment options are available, depending on the severity. Mild to Moderate Keratoconus may be treated with Corneal Collagen Crosslinking, which uses riboflavin solution and UV light to strengthen the cornea. But if the cornea becomes scarred, penetrating (PKP) or partial (DALK) corneal transplant surgery is the only other option. Keratoconus can worsen if not detected early.