Mobility performance with retinitis pigmentosa

Black, Alexander A., Lovie-Kitchin, Jan E., Woods, Russell L., Arnold, Nicole, Byrnes, John, & Murrish, Jane (1997) Mobility performance with retinitis pigmentosa. Clinical and Experimental Optometry, 80(1), pp. 1-12.



Purpose: Reduced mobility can have a serious impact on quality of life. Though previous studies have demonstrated that some vision measures relate to the mobility of subjects with simulated and true low vision, the relationship between residual vision and mobility is not clear. We investigated the relationship between clinical vision measures and mobility performance under different illumination levels for subjects with retinitis pigmentosa (RP).
Methods: Binocular visual acuities, letter contrast sensitivities and static central threshold visual fields were measured on 10 subjects with RP and nine age-matched control subjects. Mobility performance was measured on an indoor mobility course at high and low illuminance and was assessed by percentage preferred walking speed (PPWS) and number of errors.
Results: The RP group showed significantly reduced PPWS and greater numbers of errors than the control group. The reduction in illumination resulted in significantly worse error and PPWS scores. Unlike the control group, the presence of a glare source did not reduce the PPWS of the RP group under high illumination. Multiple regression analyses showed that the average visual field extent was the most significant predictor of mobility; letter contrast and visual acuity added to the regression models of the low illumination measures to account for up to 75 per cent of the variation in mobility performance.
Conclusions: People with RP have worse mobility than people with normal vision, more so under reduced illumination levels. Visual field extent was the strongest predictor of mobility performance.

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ID Code: 5642
Item Type: Journal Article
Refereed: Yes
Additional Information: The contents of this journal from 1998 to 2005 can be freely accessed online via the journal’s web page (see link).
Additional URLs:
Keywords: mobility, retinitis pigmentosa
ISSN: 0816-4622
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 1997 Optometrists Association Australia
Deposited On: 25 Jan 2008 00:00
Last Modified: 10 Aug 2011 18:25

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