title: Mobility spectacles for a patient with ankylosing spondylitis.
abstract: A patient with severe postural deformity and mobility difficulties due to ankylosing spondylitis benefits from specially designed rim-less spectacles incorporating yoked fresnel base-down prisms.
mesh_terms: D005139:Eyeglasses; D006801:Humans; D008124:Locomotion; D008297:Male; D008875:Middle Aged; D055095:Optics and Photonics; D011187:Posture; D011859:Radiography; D013167:Spondylitis, Ankylosing / Q000150:complications* / Q000000981:diagnostic imaging / Q000503:physiopathology; D014786:Vision Disorders / Q000209:etiology* / Q000628:therapy