Collier's sign (also known as Collier's tucked lid sign[1] or posterior fossa stare[2]) is bilateral or unilateral eyelid retraction.
It is an accepted medical sign of a midbrain lesion, first described in 1927 by J Collier.
[3] With the eyes in the primary position, the sclera can be seen above the cornea, and further upgaze increases the distance between the eyelids and irises.
[5] The cause is thought to be damage to the posterior commissure levator inhibitory fibres[2] which originate in the M-group of neurons.
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