Safe size of corneal graft with less chances of failure is -: (A) 7.5 mm, (B) 5.5 mm, (C) 6.5 mm, (D) 4.5 mm
Answer is A. With the help of a corneal trephine (7.5 mm to 8 mm in size)a paial thickness incision is made in the hostcornea . Then, anterior chamber isentered with the help of a razor blade knife andexcision is completed using corneo-scleral scissors. REF:Comprehensive ophthalmology,AK Khurana,4th edition,pg no.125.