Nonstrabismic binocular dysfunctions and cervical complaints: The possibility of a crossdysfunction

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URI: http://hdl.handle.net/10498/21825
DOI: 10.1371/journal.pone.0209710
ISSN: 1932-6203
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2019-01Department
Enfermería y FisioterapiaSource
PLoS ONE 14(1): e0209710Abstract
The aim of this study is to establish a relationship between non-strabismic binocular dysfunction
and neck pain. One hundred twelve participants underwent binocular vision assessment
by evaluating horizontal heterophoria, horizontal and vertical fusional vergence
ranges and vergence facility. The subjects were classified into two groups: binocular anomalies
and normal binocular function. Neck complaints were measured with the Neck Disability
Index, visual analogue scale, cervical range of motion, deep-flexor muscle activation
score (AS) and performance index (PI). Our results showed that participants with low AS
had significantly altered values of lateral phoria (near) (mean = -6.99 SD ± 6.96 PD) and
PFV (near) blur (mean = 9.49 SD ± 5.45 PD) against those who presented normal AS (lateral
phoria (near) mean = -3.64 SD ± 6.37 PD; PFV (near) blur mean = 12.84 SD ± 6.20 PD). In
addition, participants with NFV (near) recovery outside the norm had a significantly lower
right side-bending (mean = 35.63 SD ± 8.35 PD) than those within the standard (mean =
39.64 SD ± 9 PD). The subjects with binocular vision impairment showed a diminished
response to the deep cervical musculature, with low AS and PI, as well as a tendency to suffer
from cervicalgia of more than three months’ evolution and a lower range of motion.
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