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Abbas R1, Houri M2, Rayyan M3, Hamada H4, Saab I1
1Beirut Arab University, Physical Therapy, Beirut, Lebanon, 2Beirut Arab University, Faculty of Medicine, Beirut, Lebanon, 3Beirut Arab University, Faculty of Dentistry, Beirut, Lebanon, 4Cairo University, Faculty of Physical Therapy, Biomechanics, Cairo, Egypt
Background: 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 0.05) during multifocal lens wearing, in contrast to higher flexion angles between C3/C4 and C4/C5 (p 0.05) when wearing unifocal lenses.
Conclusion(s): Multifocal lens spectacles produce increased extension in the cervical vertebrae angles when compared with the use of unifocal lenses.
Implications: results of the current study will help physiotherapists and ophthalmologists choosing the suitable type of spectacles when correcting presbyopia.
Keywords: spectacles, presbyopia, cervical posture
Funding acknowledgements: NONE
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 0.05) during multifocal lens wearing, in contrast to higher flexion angles between C3/C4 and C4/C5 (p 0.05) when wearing unifocal lenses.
Conclusion(s): Multifocal lens spectacles produce increased extension in the cervical vertebrae angles when compared with the use of unifocal lenses.
Implications: results of the current study will help physiotherapists and ophthalmologists choosing the suitable type of spectacles when correcting presbyopia.
Keywords: spectacles, presbyopia, cervical posture
Funding acknowledgements: NONE
Topic: Occupational health & ergonomics; Musculoskeletal: spine; Health promotion & wellbeing/healthy ageing
Ethics approval required: Yes
Institution: Beirut Arab University
Ethics committee: Institutional review board
Ethics number: 2016H0022-HS-R-128
All authors, affiliations and abstracts have been published as submitted.
