title: Minimizing radial-keratotomy-induced diurnal variation in vision using contact lenses.
abstract: A 41-year-old man with 16 radial keratotomy (RK) incisions in each eye reported a paradoxical diurnal variation in vision in both eyes with low Dk/L soft contact lenses. After rk, the patient experienced the conventional diurnal change a morning-to-evening mean (right and left eyes) myopic change of -1.80 diopters (D). However, while wearing low Dk/L contact lenses, a paradoxical morning-to-evening mean hyperopic change of 2.30 D was found. The diurnal variation was minimized (0.50 D) by wearing high Dk/L contact lenses. These results suggest that contact lenses can be used to treat diurnal variation in manifest refraction after RK by inducing appropriate stress.
authors.affiliation: Department of Ophthalmology, Osaka University Medical School, Suita, Osaka, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Inoue
authors.forename: N
authors.initials: N
authors.lastname: Maeda
authors.forename: Y
authors.initials: Y
authors.lastname: Inoue
authors.forename: Y
authors.initials: Y
authors.lastname: Shimomura
authors.forename: Y
authors.initials: Y
authors.lastname: Tano
mesh_terms: D000328:Adult; D002940:Circadian Rhythm; D003263:Contact Lenses, Hydrophilic; D003315:Cornea / Q000601:surgery*; D006801:Humans; D007646:Keratotomy, Radial / Q000009:adverse effects*; D008297:Male; D009216:Myopia / Q000601:surgery*; D012029:Refraction, Ocular; D014786:Vision Disorders / Q000209:etiology / Q000628:therapy*