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An eye infection may be caused by a virus, bacterium or fungus. Patients may have eye infection in one eye or both eyes, and may have infections that affect different parts of the eye. There are several different types of eye infections.
A sty is a lump that forms near the eyelid’s edge, which is commonly caused by the bacterium staphylococcus. Other bacteria and chronic inflammation may also cause a sty. Symptoms include eyelid swelling, tearing and eyelid pain along with the red lump.
Treatments include antibiotics, which can be administered as a topical solution or eye drops, and surgery, which is used in cases in which the sty is pus-filled and will not rupture.
Patients with conjunctivitis have either an infection or swelling of the conjunctiva, which is the membrane that lines the eyelids. MedlinePlus noted that the most common cause of conjunctivitis is viruses. Bacteria, fungi, chemical exposure and allergies may also cause the condition. Symptoms include sensitivity to light, blurred vision, increased tearing and eye pain.
The treatment of conjunctivitis depends on its cause. For example, bacterial conjunctivitis is treated with antibiotics, allergic conjunctivitis is treated with allergy medications, and viral conjunctivitis goes away on its own.
Keratitis is an infection of the cornea, which is the clear covering on the front of the eye. If a patient has superficial keratitis, then the infection affects the outermost layers of the cornea and does not leave scars. But if a patient has deep keratitis, the deeper corneal layers are affected, which may result in scarring.
There are several different types of keratitis: fungal keratitis (caused by fungi), herpes keratitis (caused by the herpes simplex virus), bacterial keratitis (caused by bacteria), photokeratitis (caused by intense exposure to ultraviolet radiation) and amoebic keratitis (caused by Acanthamoeba).
Keratitis can cause excessive tearing, eye pain and blurred vision. Treatment will depend on the cause of the keratitis.
Parinaud Oculoglandular Syndrome