World Keratoconus Day: Keratoconus is a rare degenerative eye condition where the dome-shaped outer lens of the eye called cornea becomes cone-shaped because of thinning due to this progressive, degenerative disorder. It can lead to vision distortion and if left untreated for a long time, it can also cause permanent blindness. Recently, late actor Puneeth Rajkumar’s cornea was donated to four patients out of which two suffered from Keratoconus. Although two corneas from a donor are usually transplanted into two corneal blind patients, but in case of actor Puneeth Rajkumar, his corneas were sliced into four parts and went to four different patients.