Table 2.

Situations of corneal sensation alterations that may limit the use of corneal reflex if present concurrently with trigeminal neuralgia.

Infectious diseases  Type 1 herpes simplex  Varicella zoster virus  Mycobacterium leprae  Fungal infections

Autoimmune disorder  Diabetes mellitus  Grave's disease  Sjögren's syndrome

Ophthalmic procedures and surgeries  Corneal transplant  Laser and other ocular surgeries including laser-assisted in situ keratomileusis (LASIK)  Photorefractive keratectomy (PRK)

Ophthalmic medication  Antiglaucoma topical medication especially topical beta-adrenergic antagonists  Benzalkonium chloride

Age  Advanced age