Medical Conditions | Uncategorized

Diplopia

Double vision, a condition in which vision in one eye is no longer co-ordinated with vision in the other, so the patient sees the same object in two different places, displaced in any direction or partly overlapping. Patients with a squint also have uncoordinated eyes, but do not see double because the brain suppresses one of the images. Double vision can have various causes, some of them relatively innocent – for example through excessive alcohol consumption, overtiredness or slight concussion, in which cases it disappears with the cause. Persistent double vision can be caused by injury to an eye muscle, or detachment of the muscle from the eye socket; the eye cannot then move in all directions, and thus sees double in certain fields. Sometimes the head has to be held in a certain position to avoid double vision. Such failure can be caused by a tumour, inflammation, an accident or haemorrhage. In a few cases a certain nerve is absent at birth, and the condition is congenital. In myasthenia gravis double vision arises in the course of the day because the muscles function improperly. Treatment of double vision depends on the underlying cause. A paralysed eye muscle sometimes heals of its own accord, but surgery may be advisable. Covering the abnormal eye gives temporary relief. Myasthenia gravis is treated by medication. Pushing apart of bone ends in a joint by an injury, often associated with tearing of the joint capsule and ligaments which normally hold the joint together. Damage to blood vessels can cause haemorrhage in the joint. Further characteristics of dislocation are abnor-

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