<prompt> Which of the following is not a treatment modality for KeratoconusSpectaclePrismContact lensINTACS  <response>: Prism -Prisms are used in Squint and not in keratoconus Rx Protocol for Keratoconus 1. SPECTACLE 2. CONTACT LENSES USED IN KERATOCONUS Rigid Gas Permeable Scleral lenses Rose K lenses Soper lenses 3. COLLAGEN CROSS LINKING C3R: INTACS Penetrating keratoplasty 4.INTACS Intracorneal ring segments Reduce corneal steepening, made of PMMA. Used in Pellucid Marginal Degeneration, post LASIK ectasia and keratoconus. 5.SURGERY DALK deep anterior Lamellar keratoplasty ALTK Anterior lamellar therapeutic keratoplasty Penetrating Keratoplasty: When full thickness of cornea is involved as in hydrops with scar 