Organism not invading intact cornea -
Following three pathogens can invade the intact corneal epithelium and produce ulceration:Neisseria gonorrhoea,corynebacterium diphtheriae and Neisseria meningitidis. Reference:Comprehensive Ophthalmology,AK Khurana,6th edition,pg no.99
Gonococci
C. diphtheriae
Meningococci
Pseudomonas
Cornea and sclera