Abstract
Objective: To investigate the incidence of asthenopia in the general public in China and the factors that influence it. Methods: This was a cross-sectional investigation. A questionnaire was distributed to the general public in China from June 2016 to January 2017 by paper and the internet. The questionnaire included three main dimensions: Eye discomfort, visual symptoms and systemic symptoms. Results: A total of 1 909 valid questionnaires were collected from 163 cities in 24 provinces and were included in this cross-sectional investigation study. The incidence of ocular complaints and dry eye was 13.28% and 16.26%, which were the most common symptoms in the eye discomfort dimension. The incidence of ocular complaints and dry eye was significantly higher in people over 40 years of age than in people below 40 years of age (χ2=13.359, P<0.001; χ2=9.870, P=0.002). Among people who had dry eye, there was a 44.85% incidence of ocular complaints and there was a 54.66% incidence of dry eye among people who had ocular complaints. There was a significant correlation between dry eye and ocular complaints (r=0.407, P=0.01). The incidence of blur and blur that cleared after blinking was 11.51% and 11.95%, respectively, which were the most common symptoms in the visual symptom dimension. The incidence of hard to focus and forgetful, and slower reading speed were 13.05% and 13.13%, respectively, which were the most common symptoms in the systemic symptom dimension. Age was significantly related to these symptoms (OR=1.02, P=0.008; OR=1.02, P<0.001). Conclusions: The incidence of different asthenopia symptoms in the general public in China is high, including eye discomfort, visual symptoms and systemic symptoms. Age and amount of time working at near distance are important factors for eye discomfort. Age is the important factor for the visual and systemic symptoms of asthenopia. Key words: asthenopia; eye discomfort; visual symptom; systemic symptom
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