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  2. Lea test - Wikipedia

    en.wikipedia.org/wiki/Lea_test

    It is especially vital to assess a child's contrast sensitivity at a young age in order to determine the distance and accuracy with the child can distinguish facial features. A very popular test designed specifically for this reason is the "Hiding Heidi Low Contrast Face Pictures" test (which the LEA Vision Test System produces a version of.)

  3. Contrast (vision) - Wikipedia

    en.wikipedia.org/wiki/Contrast_(vision)

    Contrast sensitivity is typically expressed as the reciprocal of the threshold contrast for detection of a given pattern (i.e., 1 ÷ contrast threshold). [15] Using the results of a contrast sensitivity exam, a contrast sensitivity curve can be plotted, with spatial frequency on the horizontal, and contrast threshold on the vertical axis.

  4. Infant visual development - Wikipedia

    en.wikipedia.org/wiki/Infant_visual_development

    The threshold for light sensitivity is much higher in infants compared to adults. From birth, the pupils of an infant remain constricted to limit the amount of entering light. In regards to pupil dimensions, newborns' pupils grow from approximately 2.2 mm to an adult length of 3.3 mm. [ 2 ] A one-month-old infant can detect a light threshold ...

  5. Chubb illusion - Wikipedia

    en.wikipedia.org/wiki/Chubb_illusion

    The Chubb illusion is similar to another visual illusion, the contrast effect.The contrast effect is an illusion in which the perceived brightness or luminance of an identical central visual target form on a larger uniform background varies to the test subject depending on the ratio of the central form's luminance to that of its background. [4]

  6. Sensitometry - Wikipedia

    en.wikipedia.org/wiki/Sensitometry

    Therefore contrast ratio = 50 : 1 (50 to 1). When applied to the negative film version of the same test card, the maximum density is 1.30 although the minimum density remains at 0.30. The contrast ratio of the negative is therefore as follows: contrast ratio = antilog (1.3-0.3) = antilog (1.0)

  7. Opponent process - Wikipedia

    en.wikipedia.org/wiki/Opponent_process

    Log-log plot of spatial contrast sensitivity functions for luminance and chromatic contrast [improve caption] The neurological conversion of color from LMS color space to the opponent process is believed to take place mostly in the lateral geniculate nucleus (LGN) of the thalamus, though it may also take place in the retina bipolar cells.

  8. When to Use Salted vs. Unsalted Butter, According to Our ...

    www.aol.com/salted-vs-unsalted-butter-according...

    The straight facts about our favorite fat. As a highly opinionated group, our team doesn’t always agree on some key culinary questions.

  9. De Vries–Rose law - Wikipedia

    en.wikipedia.org/wiki/De_Vries–Rose_Law

    Threshold increment versus background luminance for various target diameters (in arcmin). Data from tables 4 and 8 of Blackwell (1946), plotted in Crumey (2014).. The law predicts that if log is plotted against log, the threshold curve for low will be a straight line with gradient 1/2, but this is only approximately true in the interval between the very darkest background level (gradient 0 ...