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--- visual_sensory [2025/07/12 16:47]
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+++ visual_sensory [2025/09/09 09:45] (current)
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 # Visual Sensory
+Characteristics of visual sensory processing include: visual acuity, contrast sensitivity, color vision, and night vision.
+## Red light will not destroy rods' dark adaptation
+When stimulated by light, rods rapidly lose their sensitivity, and it takes a long time for them to regain it (up to a half hour) once they are returned to the darkness.
+Illuminating objects in red light in a dark environment will not destroy the rods’ dark adaptation. For example, on the bridge of a ship, the navigator may use a red lamp to stimulate cones to read the fine detail of a chart. This stimulation with red light will not destroy the rods’ dark adaptation and hence will not disrupt the ability of personnel to scan the horizon for faint lights or dark forms.
 ## Illuminance (lux) and Brightness (nits)
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 {{::lcd_screen_readablility_in_sunlight.png?600|}}
 {{::readability_and_contrast_ratio.png?600|}}
+## Black text on white background is easier to read
+Because of certain asymmetries in the visual processing system, dark text on lighter background (“negative contrast”) also offers higher contrast sensitivity than light on dark (“positive contrast”). The disruptive tendency for white letters to spread out or “bleed” over a black background is called **irradiation**

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