Ptosis, drooping of the eyelid, may need to be differentiated from pseudoptosis or functional ptosis. This may result simply from a redundant tarsal skin fold, especially in older patients, or be a functional condition. Frontalis underactivity may be a clinical indicator of the latter diagnosis (cf. compensatory overactivity of frontalis with other causes of ptosis).
The term has also been used in Hypotropia; when the nonhypotropic eye fixates, the upper lid follows the hypotropic eye and appears ptotic, disappearing when fixation is with the hypotropic eye.
Hop JW, Frijns CJ, van Gijn J. Psychogenic pseudoptosis. Journal ofNeurology 1997; 244: 623-624
Stone J. Pseudo-ptosis. Practical Neurology 2002; 2: 364-365