Hello It seems from the history that you are having red eyes for a long time. This can be because of chronic conjuncitvitis, allergic conjunctivitis, degenerations of conjunctiva like pterygium or pinguecula, hyperemia of conjunctiva... If you have discharge along with redness it is chronic conjunctivitis, if symptoms of allergy like itching is present it is allergic conjunctivitis, if there is a growth on the conjunctiva it can be conjunctival degenerations... The treatment is by treatment of the underlying cause, symptomatic relief can be obtained by use of decongestant eye drops. Hence I advice you to consult your doctor for examination and treatment accordingly. Thank you