The location of the corneal ulcers at the central edge is 56.25%, the morphologically, the dendritic ulcer accounts for 60.42%, the geographic ulcer accounts for 21.87%, The depth of corneal ulcers from 1/3 to 2/3 of the corneal thickness accounts for 82.29%, the diameter of corneal ulcers, from 3 - 6 mm accounts for 71.88%, over 6 mm accounts for 18.75%.