Gunn’s syndrome was first was described by the British ophthalmologist Markus Gunn. The disease includes blepharoptosis in combination with its consensual lifting at the movements of lower jaw. The consensual movements appear during mouth opening, movements of jaw to side opposite to the eye on which the blepharon (occasionally in the same side) is lowered, at jaw pulling forward, lips movements, clenching teeth. Degree of expression of Gunn syndrome varies over wide range. In 50-60% of cases it is combined with strabismus.
Hun syndrome is usually one-side, is found at infancy when during suction of breast or food from a small bottle mother notes the strange rhythmical movements of baby’s upper eyelid.
Most often Hun syndrome is congenital. Acquired sometimes develops against the progressing vascular failure of brain or after a psychic trauma.
Physicians explain the associated movements of jaw and blepharon with pathological connection of cranial nerves when there are abnormal links between brain cells the processes of which form nerves. It is considered that the cornerstone of a Hun syndrome is the restoration of ancient branchial-oral connection because blepharon muscles develop in embryo from germs which in fishes move the operculum. In fishes when opening mouth branchial covers raise, the alimentary and respiratory movements are combined.
Forecast is favorable. Adult patients often say that combined movements decrease in some time. But objectively it is not confirmed. Probably, adults pay less attention to twitching of blepharon or manage to mask them. At the expressed ptosis of a blepharon or combination with strabismus surgical treatment is prescribed.