There is limited evidence on the costs of corneal cross-linking, a cost-effectiveness study estimated the costs of the total treatment for one person as £928 ($1,392 U.S.) in the UK National Health Service, but this may be as high as $6,500 per eye in other countries. A 2013 cost-benefit analysis by the Lewin Group for Eye Bank Association of America, estimated an average cost of $16,500 for each corneal transplant. Related disorders
Several other corneal ectatic disorders also cause thinning of the cornea:
Keratoglobus is a very rare condition that causes corneal thinning primarily at the margins, resulting in a spherical, slightly enlarged eye. It may be genetically related to keratoconus. Pellucid marginal degeneration causes thinning of a narrow (1–2 mm) band of the cornea, usually along the inferior corneal margin. It causes irregular astigmatism that, in the early stages of the disease can be corrected by spectacles. Differential diagnosis may be made by slit-lamp examination. Posterior keratoconus, a distinct disorder despite its similar name, is a rare abnormality, usually congenital, which causes a nonprogressive thinning of the inner surface of the cornea, while the curvature of the anterior surface remains normal. Usually only a single eye is affected. Post-LASIK ectasia is a complication of LASIK eye surgery. References
External links

Keratoconus at Curlie
Roughness may refer to:

Surface roughness, the roughness of a surface
Roughness length, roughness as applied in meteorology
International Roughness Index, the roughness of a road
Hydraulic roughness, the roughness of land and waterway features
Roughness (psychophysics) in psychoacoustics refers to the level of dissonance
The roughness of a line or surface, measured numerically by the Hausdorff dimension
Roughness/resel, the resel/roughness of an image/volume
Unnecessary roughness, a type of foul in gridiron football

See also
Surface finish