Viral conjunctivitis
Bacterial conjunctivitis
Allergic conjunctivitis
Acute angle closure glaucoma
Uveitis
Keratitis (eg: herpes keratitis)
Corneal abrasion
Trauma/Ocular foreign body
Chemical exposure
Dacryocystitis
Reactive arthritis
Cluster headache
Keratoconjunctivitis
Viral conjunctivitis
Conjunctivitis 
Bacterial conjunctivitis
Conjunctivitis
Allergic conjunctivitis
Allergic rhinitis
Acute angle closure glaucoma