title: Improving nighttime mobility in persons with night blindness caused by retinitis pigmentosa: A comparison of two low-vision mobility devices.
abstract: This study compared the effectiveness of the ITT Night Vision Viewer with the Wide Angle Mobility Lamp (WAML) as low-vision mobility devices for people experiencing night blindness due to retinitis pigmentosa (RP). Both engineering bench testing and functional evaluations were used in the assessments. Engineering evaluations were conducted for (1) consistency of the manufacturer's specifications, (2) ergonomic characteristics, (3) modifications of devices, and (4) pedestrian safety issues. Twenty-seven patients with RP conducted rehabilitation evaluations with each device that included both clinical and functional tests. Both devices improved nighttime travel for people with night blindness as compared with nighttime travel with no device. Overall, the WAML provided better travel efficiency-equivalent to that measured in daytime. Recommendations have been developed on ergonomic factors for both devices. Although some participants preferred the ITT Night Vision Viewer, overall most participants performed better with the WAML.
authors.affiliation: Vision Rehabilitation Research Laboratory, Hefner Department of Veterans Affairs (VA) Medical Center, Salisbury, NC 28144, USA. rickilyn.mancil@med.va.gov
authors.forename: Rickilyn M
authors.initials: RM
authors.lastname: Mancil
authors.forename: Gary L
authors.initials: GL
authors.lastname: Mancil
authors.forename: Ellis
authors.initials: E
authors.lastname: King
authors.forename: Claudine
authors.initials: C
authors.lastname: Legault
authors.forename: Julie
authors.initials: J
authors.lastname: Munday
authors.forename: Salvatore
authors.initials: S
authors.lastname: Alfieri
authors.forename: Rod
authors.initials: R
authors.lastname: Nowakowski
authors.forename: Bruce B
authors.initials: BB
authors.lastname: Blasch
mesh_terms: D000328:Adult; D004867:Equipment Design; D006804:Ergonomics; D005135:Eye Protective Devices / Q000145:classification; D005260:Female; D006801:Humans; D007909:Lenses / Q000145:classification*; D008124:Locomotion; D008297:Male; D008875:Middle Aged; D051346:Mobility Limitation; D009755:Night Blindness / Q000209:etiology / Q000534:rehabilitation*; D012016:Reference Values; D012174:Retinitis Pigmentosa / Q000150:complications*; D012682:Sensory Aids / Q000145:classification*; D015354:Vision, Low / Q000209:etiology / Q000534:rehabilitation*