The best replacement for keratitis is conjunctivitis.

The best alternatives to keratitis are rated as following:
★★★★★  conjunctivitis
★★  corneal ulcer
★★  scleritis
★  corneal abrasion
★  iritis
★  keratoconjunctivitis
  keratopathy
  herpes zoster ophthalmicus
  corneal ulceration
  keratitis
  bacterial conjunctivitis

Your alternative for keratitis is not listed? Suggest!
Speaking about keratitis, one probably shouldn't forget about herpes simplex.

Other search terms related to keratitis and their ratings are:
★★★★★ herpes simplex
You have in mind a companion for keratitis and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of keratitis in all years. Click on graph for more.
keratitis
conjunctivitis
corneal ulcer