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Reduced Contrast Sensitivity Function in Central and Peripheral Vision by Disability Glare.

Di Wu1, Na Liu1, Pengbo Xu1

  • 1Yueyang Vocational Technical College, China.

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Glare significantly impairs visual performance, especially in central vision, increasing accident risk. Transient glare causes more discomfort, while steady glare causes greater visual performance reduction.

Keywords:
central visioncontrast sensitivity function (CSF)disability glarenearly peripheral vision

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Area of Science:

  • Vision science
  • Ophthalmology
  • Human factors engineering

Background:

  • Glare from various sources negatively impacts visual performance and driver safety.
  • Understanding glare sensitivity across visual fields is crucial for mitigating risks.

Purpose of the Study:

  • To systematically investigate glare sensitivity in central and peripheral vision.
  • To measure contrast sensitivity function (CSF) under steady and transient glare conditions.
  • To compare the effects of glare on visual performance and subjective discomfort.

Main Methods:

  • Contrast sensitivity function (CSF) was measured in nine observers with normal vision.
  • Measurements were taken in central and peripheral visual fields under nonglare, steady glare, and transient glare.
  • Visual performance was assessed using the area under the log CSF (AULCSF) and cut-off spatial frequency.

Main Results:

  • Both steady and transient glare reduced AULCSF and cut-off frequency, indicating decreased visual performance.
  • Central vision showed greater reductions in visual performance compared to peripheral vision.
  • Steady glare caused more significant visual performance decline than transient glare, while transient glare induced higher discomfort.

Conclusions:

  • Glare, particularly steady glare, substantially degrades visual performance, with central vision being more affected.
  • Transient glare, though less impactful on visual performance, causes greater subjective discomfort.
  • Findings highlight the differential effects of glare types on visual function and perception, informing safety measures.