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    Influence of gravity on ocular lens position.

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    Publication date
    2016
    Author
    Lister, L.J.
    Suheimat, M.
    Verkicharla, P.K.
    Mallen, Edward A.H.
    Atchison, D.A.
    Keyword
    Accommodation, Anterior chamber depth, Gravity, Lens, Human ocular lens position
    Rights
    © 2016 ARVO. Reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    yes
    
    Metadata
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    Abstract
    Purpose: To determine whether human ocular lens position is influenced by gravity. Methods: Anterior chamber depth and lens thickness were determined with a Haag-Streit Lenstar LS900 for right eyes of participants in two age groups, with a young group of 13 participants aged 18 to 21 years (mean 21 years, SD 1 year) and an older group of 10 participants aged 50 to 63 years (58 years, 4 years). There were two sessions for each participant separated by at least 48 hours, with one session for the usual upright head position and one session for a downwards head position. In a session, testing was done for minimum accommodation followed by testing at maximum accommodation. A drop of 2% pilocarpine nitrate was instilled, and testing was repeated after 30 minutes under minimum and maximum accommodation conditions. Results: Gravity, manipulated through head posture, affected anterior chamber depth for both young adult and older adult groups but mean effects were only small, ranging from 0.04 to 0.12mm, and for the older group required the instillation of an accommodation-stimulating drug. Gravity had a weakly significant effect on lens thickness for the young group without accommodation or a drug, but the effect was small at 0.04±0.06mm (mean±SD, p = 0.04). Conclusion: There is a small but real effect of gravity on crystalline lens position, manifested as reduction in anterior chamber depth at high levels of accommodative effort with the head in a downwards position. This provides evidence of the ability of zonules to slacken during strong accommodation.
    URI
    http://hdl.handle.net/10454/7728
    Version
    Published version
    Citation
    Lister LJ, Suheimat M, Verkicharla PK, Mallen EAH and Atchison DA (2016) Influence of gravity on ocular lens position. Investigative Ophthalmology and Visual Science. 57: 1885-1891.
    Link to publisher’s version
    http://dx.doi.org/10.1167/iovs.15-18533
    Type
    Article
    Collections
    Life Sciences Publications

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