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- Glossary
Brightness
Brightness is one of the dimensions of visual perception: the perception of light intensity. It influences the size of the pupil.
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- Page
Glossar
15.03.2017
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- Glossary
Color blindness
The inability to perceive colors. Instead, those affected only see brightness. This can be caused by hereditary cone blindness or a retinal disease, for example, but also by damage to the optic nerves or visual association areas.
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- Glossary
Iris
The (German) name "rainbow membrane" refers to the pigment coloration of the iris. Its size changes depending on the brightness of the surroundings, and with it the size of the pupil.
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- Glossary
Afterimage
An image that is perceived after the actual image is no longer present. An afterimage normally occurs when you have stared at an image for about a minute. In the case of positive afterimages, the image has similar brightness and colors to the original. Negative afterimages occur more frequently: when looking at a white surface, the image previously viewed appears there in the respective complementary color. Afterimages are caused by the "overfatigue" of the photoreceptors, which stop sending signals to the brain after a certain period of viewing.
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- Glossary
Pupil
The opening in the eye through which light enters. The size of the pupil is determined by the iris and changes reflexively (pupillary reflex). This process of adjusting to the brightness of the environment is called adaptation.
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- Grundlagen
- Anatomy
The Occipital Lobe
The sophisticated interconnection of the occipital lobe demonstrates just how complex the visual process is.
28.08.2025
