Preliminary study on visual recognition under low visibility conditions caused by artificial dynamic smog
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Fan Lyu and Jun Jiang. Eye Hospital of Wenzhou Medical University, #270 Xueyuan West Road, Lucheng District, Wenzhou 325027, Zhejiang Province, China. lufan62@mail.eye.ac.cn; jjhsj@hotmail.com

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Supported by National Nature Science Foundation of China (No. 81570880).

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    Abstract:

    AIM: To quantitatively evaluate the effect of a simulated smog environment on human visual function by psychophysical methods. METHODS: The smog environment was simulated in a 40×40×60 cm3 glass chamber filled with a PM2.5 aerosol, and 14 subjects with normal visual function were examined by psychophysical methods with the foggy smog box placed in front of their eyes. The transmission of light through the smog box, an indication of the percentage concentration of smog, was determined with a luminance meter. Visual function under different smog concentrations was evaluated by the E-visual acuity, crowded E-visual acuity and contrast sensitivity. RESULTS: E-visual acuity, crowded E-visual acuity and contrast sensitivity were all impaired with a decrease in the transmission rate (TR) according to power functions, with invariable exponents of -1.41, -1.62 and -0.7, respectively, and R2 values of 0.99 for E and crowded E-visual acuity, 0.96 for contrast sensitivity. Crowded E-visual acuity decreased faster than E-visual acuity. There was a good correlation between the TR, extinction coefficient and visibility under heavy-smog conditions. CONCLUSION: Increases in smog concentration have a strong effect on visual function.

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Xu-Hong Zhang, Zhe-Yi Chen, Bin-Bin Su, et al. Preliminary study on visual recognition under low visibility conditions caused by artificial dynamic smog. Int J Ophthalmol, 2018,11(11):1821-1828

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Publication History
  • Received:February 25,2018
  • Revised:September 18,2018
  • Adopted:
  • Online: November 07,2018
  • Published: