Intracorneal rings are indicated in patients whose central cornea does not present opacity and whose visual acuity is not satisfied despite correction with lenses or linked to an intolerance to lenses.

Surgeries such as crosslinking and intracorneal rings placement are alternatives to corneal transplantation with the expected effects: stabilization of the disease for corneal collagen crosslinking and visual rehabilitation by the placement of intracorneal rings.

The main objective of this study is to evaluate visual benefit1 year after placement of intracorneal rings using laser in keratoconus

Inclusion Criteria:

• Patient having received the information notice/non-objection
• Adult man or woman (over 18)
• Failure of a lens fitting adaptation
• Patient with a diagnosis of keratoconus
• Patient operated at Somain institute with the placement of intra-corneal rings

Exclusion Criteria:

• Minor
• Post-lasik ectasia
• Iatrogenic Keratoconus
• Protected patient: adult under guardianship, curatorship or other legal protection, deprived of liberty by judicial or administrative decision

Patient operated at Somain institue with the placement f intra-corneal rings using laser