Blockage of a retinal artery by a thrombus (blood clot) typically affects only one eye, causing sudden blindness or loss of part of the visual field.
It requires urgent treatment, which may include eye massage, draining fluid from the eye, or medication; even with treatment, loss of vision is usually permanent.
Blockage of a retinal vein also usually affects only one eye and tends to cause deterioration of vision over several days, although sometimes visual loss may occur suddenly.
Treatment may involve medication injected into the eye or laser surgery.
Even with treatment, there is likely to be some permanent loss of vision.

Othere related diseases

MACULAR DEGENERATION
Macular degeneration (also known as age-related macular degeneration, or AMD) is a deterioration of the macula, the central area of the retina responsible for s...

MENIERES DISEASE
Ménière’s disease is an inner ear disorder characterized by recurrent attacks of vertigo, tinnitus (ringing in the ear), and hearing loss. It is due to a bu...

OTITIS EXTERNA
In otitis externa, the outer ear canal becomes inflamed, usually due to a bacterial, viral, or fungal infection. It is sometimes called “swimmer’s ear,” b...

OTITIS MEDIA
Glue ear Otitis media is inflammation of the middle ear, usually due to a bacterial or viral infection. It is more common in children, because their Eustachian ...

OTOSCLEROSIS
In otosclerosis, there is abnormal growth of bone around the stapes, one of the three tiny bones in the middle ear that transmit sounds to the inner ear.
T...

PRESBYCUSIS
A form of sensorineural deafness, presbycusis is progressive loss of hearing that occurs with age. It is due to the natural degeneration and death of sensory ne...

PTERYGIUM
A pterygium is a wing-shaped thickening of the conjunctiva (the clear membrane covering the white of the eye) that starts on the side of the eye nearest the nos...

PTOSIS
Ptosis is abnormal drooping of the upper eyelid due to weakness of the muscle that normally keeps the eyelid raised. The sagging lid may partly or totally close...