Red Eye

Red eye -- very common and can be usually be treated by Family physicians except if life threatening (corneal ulceration, iritis, and glaucoma).\

Infections or occlusion: 
Internal Hordeolum--  infection of meiboian glands:

Sty (External Hordeolum):  infection of the gland of Zeis (the glands of eye-lashes).
Chalazion -- sterile inflammation of the meiobian glands
Blepharitis -- infection, inflammation, and scaling of the eyelid margins
Dacryocystitis -- occlusion of the nasolacrimal duct
Orbital or Periorbital cellulitis -- can spread from sinusitis
Iritis or Glaucoma -- from hyperemia of ciliary vessels
Subconjunctival Hemorrhage -- bleeding the small fragile vessels of the conjunctiva in response to minor trauma or straining.