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    Reduction of visual acuity decreases capacity to evaluate radiographic image quality

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    Authors
    Sá dos Reis, C.
    Soares, F.
    Bartoli, G.
    Dastan, K.
    Dhlamini, Z.S.
    Hussain, A.
    Kroode, D.
    McEntee, M.F.
    Mekis, N.
    Thompson, J.D.
    Affiliation
    University of Applied Sciences and Arts, Western Switzerland
    Instituto Federal de Santa Catarina (IFSC), Av. Mauro Ramos, 950, Florianopolis, Brazil
    University of Salford
    Central University of Technology, 20 President Brand St, Bloemfontein Central, Bloemfontein, 9301, South Africa
    University of Derby
    Hanze University of Applied Sciences, Groningen, Postbus 30030, 9700, RM, Groningen
    University College Cork
    University of Ljubljana, Zdravstvena Pot 5, 1000 Ljubljana, Slovenia
    Issue Date
    2020-05-16
    
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    Abstract
    To determine the impact of reduced visual acuity on the evaluation of a test object and appendicular radiographs. Visual acuity was reduced by two different magnitudes using simulation glasses and compared to normal vision (no glasses). During phase one phantom images were produced for the purpose of counting objects by 13 observers and on phase 2 image appraisal of anatomical structures was performed on anonymized radiographic images by 7 observers. The monitors were calibrated (SMPTE RP133 test pattern) and the room lighting was maintained at 7 ± 1 lux. Image display and data on grading were managed using ViewDEX (v.2.0) and the area under the visual grading characteristic (AUCVGC) was calculated using VGC Analyzer (v1.0.2). Inferential statistics were calculated using SPSS. For the evaluation of appendicular radiographs the total interpretation time was longer when visual acuity was reduced with 2 pairs of simulation glasses (15.4 versus 8.9 min). Visual grading analysis showed that observers can lose the ability to detect anatomical and contrast differences when they have a simulated visual acuity reduction, being more challenging to differentiate low contrast details. No simulation glasses, compared to 1 pair gives an AUCVGC of 0.302 (0.280, 0.333), that decreases to 0.197 (0.175, 0.223) when using 2 pairs of glasses. Reduced visual acuity has a significant negative impact on the evaluation of test objects and clinical images. Further work is required to test the impact of reduced visual acuity on visual search, technical evaluation of a wider range of images as well as pathology detection/characterization performance. It seems that visual performance needs to be considered to reduce the risks associated with incomplete or incorrect diagnosis. If employers or professional bodies were to introduce regular eye tests into health screening it may reduce the risk of misinterpretation as a result of poor vision.
    Citation
    dos Reis, C.S., Soares, F., Bartoli, G., Dastan, K., Dhlamini, Z.S., Hussain, A., Kroode, D., McEntee, M.F., Mekis, N. and Thompson, J.D., 2020. Reduction of visual acuity decreases capacity to evaluate radiographic image quality. Radiography, 26(supplement 2), pp. 1-9.
    Publisher
    Elsevier BV
    Journal
    Radiography
    URI
    http://hdl.handle.net/10545/625446
    DOI
    10.1016/j.radi.2020.04.012
    Additional Links
    https://doi.org/10.1016/j.radi.2020.04.012
    http://usir.salford.ac.uk/id/eprint/57060
    Type
    Article
    Language
    en
    ISSN
    1078-8174
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.radi.2020.04.012
    Scopus Count
    Collections
    School of Allied Health and Social Care

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