Abstract
BackgroundTo investigate the relationships between motor fusion and sex, age and spherical equivalent (SE).MethodsThis 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).ResultsThe 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).ConclusionsMotor fusion is associated with age and SE in the normal Chinese adult population.
Highlights
To investigate the relationships between motor fusion and sex, age and spherical equivalent (SE)
In conclusion, the normative parameters of motor fusion measured by synoptophore in a healthy Chinese adult population were shown in this study
Refractive error type was correlated to divergence amplitude
Summary
To investigate the relationships between motor fusion and sex, age and spherical equivalent (SE). Binocular single vision (BSV) is a brain process in which the integration of two retinal images into a single visual perception is achieved [1]. It is crucial for one’s perception in both static and dynamic situations using BSV [2]. Normal BSV requires accurate eye alignments and binocular mechanisms for sensory fusion, vergence function and stereopsis [3], which can be measured by synoptophore. Superposition, named simultaneous perception, is the ability. She et al BMC Ophthalmology (2021) 21:345 a match, the patient sees the cat with all features (tail and butterfly). Stereovision refers to the ability of the eyes to have three dimensions (3D) of spatial perception
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