TY  - JOUR
PY  - 2007//
TI  - The effects of multifocal refractive lenses on occipital extension and forward head posture during a visual task
JO  - Ergonomics
A1  - Becker, M.
A1  - Rothman, J.
A1  - Nelson, A. J.
A1  - Freedland, R.
A1  - Garcia, D.
A1  - Feit, L.
A1  - Barth, J.
A1  - Sabini, R.
SP  - 2095
EP  - 2103
VL  - 50
IS  - 12
N2  - The purpose of this study was to determine if a change in forward head posture and occipital extension occurred in participants who wore multifocal lenses vs. those persons with non-multifocal lenses while performing an 8-min visual reading task on a visual display unit (VDU). Forty-two healthy human participants were recruited for this study. Thirty-three participants completed the study. Fourteen participants wore multifocal lenses and 19 wore frames with non-multifocal lenses. To evaluate the degree of change of forward head posture and occipital extension digital photographs of cervical posture were taken at four different time intervals: prior to performing the reading task and at 3, 5 and 8 min during the reading task. The digital photographs were analysed utilizing a computer program. Two one-way ANOVA were utilized to determine the degree of change of forward head posture and occipital extension between groups. A significant difference was identified between groups for changes in degrees of forward head posture while performing a visual reading task on a VDU. However, no significant difference between groups was found for occipital extension while performing the same task. Multifocal wearers exhibit greater degrees of change in forward head posture and occipital extension than non-multifocal wearers. These postural changes may place them at a greater risk for musculoskeletal disorders and headaches.<p /> <p>Language: en</p> 
LA  - en
SN  - 0014-0139
UR  - http://dx.doi.org/10.1080/00140130701419166
ID  - ref1
ER  -