title: Effect of using prismatic eye lenses on the posture of patients with adolescent idiopathic scoliosis measured by 3-d motion analysis.
abstract: This is a preliminary investigation to detect the body sway and postural changes of patients with AIS under different spatial images. Two pairs of low-power prismatic eye lenses (Fresnel prisms) with 5 dioptre and 10 dioptre were used. In the experiment, the apices of the prisms were orientated randomly at every 22.5 degrees from 0 degrees to 360 degrees to test changes. Four patients with mean age of 11 and Cobb's angle of 30 degrees were recruited and the results showed that the low-power prisms at specific orientations (157.5 degrees and 180 degrees) could cause positive postural changes (2.1 degrees-2.7 degrees reduction of angle of trunk mis-alignment) measured by 3-D motion analysis. This might be used for controlling their scoliotic curves by induced visual bio-feedback. Apart from this laboratory test, a longitudinal study is necessary to investigate the long-term effect of the prisms at different powers and orientations (under both static and dynamic situations) on the patient's posture, spinal muscular activities, vision, eye-hand coordination, psychological state and other daily activities before it becomes an alternative management of AIS.
authors.affiliation: Rehabilitation Engineering Centre, The Hong Kong Polytechnic University, Kowloon, China. rcmswong@polyu.edu.hk
authors.forename: M S
authors.initials: MS
authors.lastname: Wong
authors.forename: A F T
authors.initials: AF
authors.lastname: Mak
authors.forename: K D K
authors.initials: KD
authors.lastname: Luk
authors.forename: J H
authors.initials: JH
authors.lastname: Evans
authors.forename: B
authors.initials: B
authors.lastname: Brown
mesh_terms: D000293:Adolescent; D001676:Biofeedback, Psychology / Q000379:methods*; D002648:Child; D005139:Eyeglasses; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D010865:Pilot Projects; D011187:Posture; D012600:Scoliosis / Q000503:physiopathology* / Q000628:therapy*; D013028:Space Perception