Effect of unifocal versus multifocal lenses on cervical spine posture in patients with presbyopia

Significance. There are many environmental considerations which may or may not lead to the development of faulty cervical mechanics. The design of near-vision lenses could contribute to the development of such cervical dysfunction and consequently neck pain. Decision-making regarding the proper type...

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Bibliographic Details
Published in:International journal of occupational safety and ergonomics 2019-01, Vol.25 (1), p.148-152
Main Authors: Abbas, Rami L., Houri, Mohamad T., Rayyan, Mohammad M., Hamada, Hamada Ahmad, Saab, Ibtissam M.
Format: Article
Language:English
Subjects:
cervical posture
cervical spine
ergonomics
multifocal lenses
presbyopia
unifocal lenses
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Summary:Significance. There are many environmental considerations which may or may not lead to the development of faulty cervical mechanics. The design of near-vision lenses could contribute to the development of such cervical dysfunction and consequently neck pain. Decision-making regarding the proper type of lens prescription seems important for presbyopic individuals. Purpose. To investigate the effect of unifocal and multifocal lenses on cervical posture. Methods. Thirty subjects (18 females and 12 males) participated in the study with an age range from 40 to 64 years. Each subject wore consequently both unifocal and multifocal lenses randomly while reading. Lateral cervical spine X-ray films were taken for each subject during each lens wearing. X-ray films were analyzed with digital software (AutoCAD 2D version 22) to measure segmental angles of the cervical vertebrae (occiput/C1, C1/C2, C2/C3, C3/C4, C4/C5, C5/C6, C6/C7, C3/C7, C0/C3, and occiput/C7). Results. Higher significant extension angles were observed in the segments C0/C7, C1/C2, C5/C6, C6/C7 and C3/C7 (p 
ISSN:1080-3548
2376-9130
DOI:10.1080/10803548.2018.1459349