Extended wear of hard gas permeable contact lenses can induce ptosis.
D001763:Blepharoptosis / Q000209:etiology*; D002986:Clinical Trials as Topic; D003262:Contact Lenses, Extended-Wear / Q000009:adverse effects*; D003263:Contact Lenses, Hydrophilic / Q000009:adverse effects*; D007839:Functional Laterality; D006801:Humans