 Recently developed and passed extensive pre-clinical testing collagen-phosphorylcholineRHCIII-MPC corneal substitute will be implanted in patients corneas with corneal scar leukoma developed after infection, trauma or keratoconus using anterior lamellar keratoplasty technique, i.e. once patients diseased anterior part of cornea is removed, either manually or with assistance of femtosecond laser, it will be substituted with proposed transparent implant. Control patients with same condition will be grafted with human donor cornea using the same surgical technique. 