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The effects of multifocal refractive lenses on occipital extension and forward head posture during a visual task

机译：多焦点屈光镜片在视觉任务中对枕骨伸展和头部向前姿势的影响

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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.
机译：这项研究的目的是确定佩戴多焦点镜片的参与者与非多焦点镜片的参与者在视觉显示装置（VDU）上执行8分钟的视觉阅读任务时是否发生前向头部姿势和枕后伸变化）。招募了42名健康人类参与者用于该研究。 33名参与者完成了研究。 14位参与者戴了多焦点镜片，19位戴了非多焦点镜片的镜架。为了评估前向头姿势和枕后伸的变化程度，在四个不同的时间间隔拍摄了颈椎姿势的数码照片：在执行阅读任务之前以及在阅读任务期间的3、5和8分钟。使用计算机程序分析了数字照片。使用两个单向方差分析确定组之间前向头部姿势和枕后伸变化的程度。在VDU上执行视觉阅读任务时，在前向头部姿势的程度变化方面，在各组之间发现了显着差异。但是，在执行相同任务时，各组之间枕骨伸展没有明显差异。与非多焦点佩戴者相比，多焦点佩戴者在向前的头部姿势和枕骨伸展方面表现出更大程度的变化。这些姿势改变可能使他们更易患肌肉骨骼疾病和头痛。

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