She M, Li T, Hu Q, Zhu J, Zhou X. Relationship between age, refractive errors and motor fusion in a normal Chinese adult population: a cross-sectional study.
BMC Ophthalmol 2021;
21:345. [PMID:
34556073 PMCID:
PMC8461894 DOI:
10.1186/s12886-021-02105-z]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 09/10/2021] [Indexed: 11/16/2022] Open
Abstract
Background
To investigate the relationships between motor fusion and sex, age and spherical equivalent (SE).
Methods
This observational study enrolled 243 healthy, nonstrabismic adults, including 94 men and 149 women aged 20 to 59 years. The subjects were divided into three groups according to SE: myopic, emmetropic and hyperopic groups. The subjects were also divided into four groups according to age: 20–29, 30–39, 40–49 and 50–59 years groups. Motor fusion was measured with a synoptophore, including subjective angle (SA), divergence, convergence and fusional vergence range (FVR).
Results
The mean values of divergence, convergence and FVR for the whole sample group were 9.72 ± 0.26°, 19.34 ± 0.54°, and 29.06 ± 0.62°, respectively. A higher value of divergence was found in the myopic group than in the emmetropic group (p < 0.05). SE and divergence were significantly different among age groups (all p < 0.05). In addition, linear regression analysis showed that SE was correlated with divergence (p = 0.003). Age was correlated with SE, divergence and FVR (p < 0.001, p = 0.005, p = 0.002, respectively). In addition, the proportion of SA being in the comfort zone (defined as the value of SA satisfying Percival’s criterion) in the age groups was significantly different (χ2 = 8.283, p = 0.041).
Conclusions
Motor fusion is associated with age and SE in the normal Chinese adult population.
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