AIM: To investigate the incidence and risk factors of near vision impairment(NVI)in patients with asthenopia.

METHODS: Totally 51 patients(102 eyes)with visual fatigue in our hospital from May 2017 to May 2018 were enrolled. According to whether the near vision of daily life is damaged, it is divided into daily near vision impairment group(24 cases)and no near vision impairment group(27 cases). General information of all patients were collected, and routine eye examination, subjective optometry and binocular eye movement parameter detection were detected.

RESULTS: In the survey, 27 patients(53%)with near vision impairment in naked eye and 24 patients(47%)with impaired near vision in daily life, and all patients had a significant improvement in visual acuity after correct optometry, and there was no one who has best corrected near visual acuity impairment. The age of patients with daily near vision impairment was significantly higher than that of patients without near vision impairment. The proportion of patients aged ≥45 years was significantly higher than that without near vision impairment(P<0.01). NRA/PRA, vergence \〖BO(40cm)\〗, and amplitude of vergence(40cm)were significantly different between the two groups(P<0.05).

CONCLUSION: Nearly half of patients with asthenopia would suffer NVI. The increase of age and imbalance between NRA and PRA as the predominant risk factors for its development.