title: Circadian rhythm: corneal curvature and refractive changes after wearing contact lenses.
abstract: The ciradian rhythm of habitual contact lens (PMMA) wearers is characterized by steepening of corneal curvature and increasing myopia after lenses have been worn during the day and flattening of corneal curvature and decreasing myopia after lenses have been removed overnight.
mesh_terms: D002940:Circadian Rhythm; D003261:Contact Lenses / Q000009:adverse effects*; D003315:Cornea / Q000033:anatomy & histology; D006801:Humans; D009216:Myopia / Q000209:etiology*