SUPPLIER

INPUT

PROCESS

OUTPUT

CUSTOMER

Ophthalmic surgeon

Patient

Preoperative evaluation

Improved visual acuity

Patient

Nurse

Donor’s cornea

Evaluation of donor’s cornea

Excellent prognosis

Technician

Surgical material

(suture and viscoelastic)

Preoperative regulation of vascular pressure

Clear cornea

Keratoplasty equipment

Trepanation of donor’s cornea

Trepanation of receiver eye