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A method to assess visual function prior to conducting medical imaging research using perceptual methodologies

Lanca, C, Thompson, John D., Lanca, L and Hogg, P 'A method to assess visual function prior to conducting medical imaging research using perceptual methodologies' , Radiologic Technology . (In Press)

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Background: Medical image perception research relies on visual data to study the quantitative relationship between a visual stimulus and an observer’s response. A gap in the literature exists to demonstrate a method to assess visual function prior to participating in medical imaging research using perceptual methodologies. Aim: Identify and explain visual function tests which could be conducted on observers prior to participation in medical imaging perception research. Methods: Following literary analysis visual assessment tests appropriate to observer studies were identified - visual acuity, contrast sensitivity and stereopsis. 30 radiography observers (mean age 31±11.7 years; range 17-57) participated in each test. Results: A small proportion (11/30; 36.7%) of the observers had a vision examination in the two years prior to this study. Mean binocular visual acuity for distance was -0.15±0.07 LogMAR (20/14) for all observers. The difference between observers who did and did not use corrective lenses was not statistically significant (p=0.12). All subjects had a normal near visual acuity (0.39±0.02 M - 20/20) and stereoacuity (41.67±7.47”). The log average values of contrast sensitivity were better than the population norms: 3cpd (1.85±0.09), 6cpd (2.16±0.15), 12cpd (1.89±0.16) and 18cpd (1.47±0.12) spatial frequencies. Conclusion: In this study all observers had normal visual function and could participate in medical imaging visual analysis studies. Observer’s visual systems performed equally well and were within normal limits when those that required corrective lenses used them. Protocols of evaluation and populations norms are provided. Further studies are necessary for understanding the relationship between visual performance and diagnostic accuracy.

Item Type: Article
Themes: Health and Wellbeing
Schools: Schools > School of Health Sciences > Centre for Health Sciences Research
Journal or Publication Title: Radiologic Technology
Publisher: American Society of Radiologic Technologists
Refereed: Yes
ISSN: 0033-8397
Funders: Non funded research
Depositing User: P Hogg
Date Deposited: 02 Apr 2015 11:05
Last Modified: 11 Jan 2016 13:47

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