Table 1.

Aetiopathogenesis of neurotrophic keratitis.

Infections	Herpes simplex Herpes zoster Leprosy [16]
Corneal pathologies	Dystrophies (i) Lattice (ii) Granular
Iatrogenic injury	Contact lens wear Surgeries Laser-assisted in situ keratomileusis [17] Corneal incision [18] Lamellar and penetrating keratoplasty
Topical medications	Anaesthetics Timolol Betaxolol Trifluridine Sulfacetamide Diclofenac sodium [19]
Toxic substances	Chemical burns Exposure to oleoresin capsicum pepper spray [20] Exposure to hydrogen sulfide (H2S) [21]
Cranial nerve V palsy	Trigeminal neuralgia surgery Neoplasm Aneurysm Facial trauma [10] Congenital:  (i) Riley-Day syndrome (ii) Möbius corneal hypoesthesia (iii) Goldenhar syndrome (iv) Familial corneal hypesthesia (v) (Familial trigeminal anesthesia) (vi) Congenital insensitivity to pain with anhidrosis
Systemic diseases	Diabetes Vitamin A deficiency Multiple sclerosis
Miscellaneous	Increasing age Adie's syndrome [22]