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    New test to assess pilot's vision following corneal refractive surgery.

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    Publication date
    2003
    Author
    Chisholm, Catharine M.
    Evans, A.D.B.
    Barbur, J.L.
    Harlow, J.A.
    Keyword
    Laser surgery
    PRK
    LASIK
    Contrast acuity
    Functional vision
    Aviation
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    All forms of corneal refractive surgery can sometimes cause an increase in optical aberrations and scattered light, which can affect visual performance. The purpose of this study was to develop a suitable test that was sensitive to retinal image degradation in subjects who have undergone excimer laser refractive surgery and that was also relevant to visual demands in commercial aviation. Methods: Assessment of the visual environment and the tasks involved in piloting a commercial aircraft formed the basis for the selection of the test parameters. The new contrast acuity assessment (CAA) test covers a functional visual field of ±5° and is based on minimum spatial vision requirements for commercial pilots. Results: Data measured in 100 normal subjects were used to define the `standard normal observer' and the range of variation for the parameters of the test. This approach makes it possible to quickly establish whether a given subject's performance falls within the range of the standard normal observer. The test is also administered under low ambient illumination since flying at night involves mesopic levels of light adaptation when the pupil size is large and the effects of aberrations and scattered light are therefore more pronounced. Conclusion: The results of the test are simple to interpret and reveal visual performance that falls outside the normal range as a result of either significant degradation of retinal image quality (caused by increased aberrations and scattered light) or abnormal processing of visual information in the retina and/or the visual pathway.
    URI
    http://hdl.handle.net/10454/3708
    Version
    No full-text available in the repository
    Citation
    Chisholm, C.M., Evans, A.D., Barbur, J.L. and Harlow, J.A. (2003). New test to assess pilot's vision following corneal refractive surgery. Aviation, Space and Environmental Medicine. Vol. 74, No. 5, pp. 551-559.
    Link to publisher’s version
    http://www.ingentaconnect.com/content/asma/asem/2003/00000074/00000005/art00010
    Type
    Article
    Collections
    Life Sciences Publications

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