Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (26): 4841-4844.doi: 10.3969/j.issn.1673-8225.2011.26.023

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Measuring the contrast resolution limits (threshold) of mesopic vision based on digital image processing technology

Zhao Yuan1, Zhao Min1, Xie Zheng-xiang2   

  1. 1Department of Ophthalmology, First Affiliated Hospital of Chongqing Medical University, Chongqing  400016, China
    2Department of Biomedical Engineering, Chongqing Medical University, Chongqing  400016, China
  • Received:2011-03-10 Revised:2011-04-20 Online:2011-06-25 Published:2011-06-25
  • Contact: Zhao Min, Professor, Department of Ophthalmology, First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China minzhao2002@yahoo.com.cn
  • About author:Zhao Yuan★, Master, Physician, Department of Ophthalmology, First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China wing1982911@163.com
  • Supported by:

    the National Natural Science Foundation of China, No. 30670536*

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Abstract:

BACKGROUND: In the optical field, the spectral luminous efficiency of eyes under scotopic vision photopic vision can be expressed as function values, but there is no uniform standard for mesopic vision.
OBJECTIVE: To measure simultaneous contrast resolution limits (threshold) of human mesopic vision in different colors background and to approach the influential factors about different colors or different grays.
METHODS: We selected 30 health volunteers who have normal corrected vision, no disease of the eyes and from 24 to 29 years of age, on MS WINDOWS operating system, and used modern digital image processing to measure.
RESULTS AND CONCLUSION: We have got contrast resolution limits (threshold) on seven kinds of background, including gray ,red, blue, yellow, cyan, purple when gray level is from 30 to 60, and set up mathematic model. The measuring of simultaneous contrast resolution limits (threshold) of human mesopic vision suggests that they would change when different colors or different gray background. The simultaneous contrast resolutionlimits (threshold) is the minimal on gray background and the maximal on cyan background, as well as we set up corresponding mathematic models.

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