Calculation of Variation of Visual Acuity and Resolvable Visual Angle by Luminance Consrast and Background Luminance(Adaptation Luminance).

Keyword

Visual Acuity,Background Luminance,Adaptation Luminance,Resolvable Visual Angle,Landolt Ring,Threshold Background Luminance,Threshold Luminance Contrast.

Reference

[1]:『照明ハンドブック第２版』(照明学会).
[2]:『Visual Acuity as aFunction of Luminance Contrast of Landolt Rings and Adaptation Luminance』(Koichi Ikeda･Koji Noda･Shoichiro Yamaguchi).

Remarks

・Approximate Curve for Visual Acuity based on Landolt Ring.VA=L/(1.6293*C^-0.3234*(0.8034*C^-0.1876+L^(1/4))^4).Reference[2].
・『As the luminance contrast of the test objects can not be discriminated below a certain adaptation luminance，the visual acuity is not defined and the above equations do not hold below this luminance．This threshold luminance is expressed as a function of the luminance contrast；i．e., L=2.974*C^-1.7234(cd／m2)』.Reference[2].

History

・2014/08/05：layout change.
・2009/10/30：Upload.