About Video

Eye signs constitute important clinical features in progressive supranuclear atrophy. As they cannot look down, they are often unable to notice food soiling their clothing while eating, often known as ‘sloppy tie sign’. For identical reason, they experience difficulty in reading books or newspapers. Though vertical saccades are lost, oculocephalic reflex or doll’s eye phenomenon is preserved, suggesting a supranuclear pathology. Bell’s phenomenon is also preserved. Square wave jerks in the horizontal movement. It is a common finding and may often be misdiagnosed as nystagmus. Convergence reaction is impaired. Additionally, the eyes on looking down often make a sweeping movement from lateral to medial side, often known as ‘round the house sign.