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A New Measure for the Assessment of Visual Awareness in Individuals with Tunnel Vision
- Source :
- AlSaqr, A M & Dickinson, C 2017, ' A New Measure for the Assessment of Visual Awareness in Individuals with Tunnel Vision ', Clinical and Experimental Optometry, vol. 100, no. 1 . https://doi.org/10.1111/cxo.12436
- Publication Year :
- 2017
-
Abstract
- Background Individuals with a restricted peripheral visual field or tunnel vision (TV) have problems moving about and avoiding obstacles. Some individuals adapt better than others and some use assistive optical aids, so measurement of the visual field is not sufficient to describe their performance. In the present study, we developed a new clinical test called the ‘Assessment of Visual Awareness (AVA)’, which can be used to measure detection of peripheral targets. Methods The participants were 20 patients with TV due to retinitis pigmentosa (PTV) and 50 normally sighted participants with simulated tunnel vision (STV) using goggles. In the AVA test, detection times were measured, when subjects searched for 24 individually presented, one degree targets, randomly positioned in a 60 degrees noise background. Head and eye movements were allowed and the presentation time was unlimited. The test validity was investigated by correlating the detection times with the ‘percentage of preferred walking speed’ (PPWS) and the ‘number of collisions’ on an indoor mobility course. Results In PTV and STV, the detection times had significant negative correlation with the field of view. The detection times had significant positive relations with target location. In the STV, the detection time was significantly negatively correlated with the PPWS and significantly positively correlated with the collisions score on the indoor mobility course. In the PTV, the relationship was not statistically significant. No significant difference in performance of STV was found when repeating the test one to two weeks later. Conclusion The proposed AVA test was sensitive to the field of view and target location. The test is unique in design, quick, simple to deliver and both repeatable and valid. It could be a valuable tool to test different rehabilitation strategies in patients with TV.
- Subjects :
- Adult
Male
medicine.medical_specialty
Adolescent
Eye Movements
Vision Disorders
Walking
Test validity
Audiology
050105 experimental psychology
Young Adult
03 medical and health sciences
0302 clinical medicine
Optics
Tunnel vision
medicine
Humans
0501 psychology and cognitive sciences
Aged
Visual search
business.industry
05 social sciences
Eye movement
Middle Aged
Test (assessment)
Visual field
Preferred walking speed
Ophthalmology
030221 ophthalmology & optometry
Female
Noise (video)
Visual Fields
medicine.symptom
business
Psychology
Retinitis Pigmentosa
Optometry
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- AlSaqr, A M & Dickinson, C 2017, ' A New Measure for the Assessment of Visual Awareness in Individuals with Tunnel Vision ', Clinical and Experimental Optometry, vol. 100, no. 1 . https://doi.org/10.1111/cxo.12436
- Accession number :
- edsair.doi.dedup.....aaa15e064e8297acd2bc5a2acaae924e