Eyes · PerceptionThe stopped clock
After a rapid eye movement, the first new image seems visible for slightly longer.
Frequency: Varies by individualEyes
Eyes · Perception
Eyes · PerceptionFloaters in vision
Threads or dots seem to move through the visual field, especially against a bright background.
Frequency: Common
Eyes · Anatomical variationIris heterochromia
Different iris colors or rings of color in one person.
Frequency: Varies by individual
Eyes · Anatomical variationDouble row of eyelashes
Extra eyelashes grow from the openings of the Meibomian glands.
Frequency: Rare
Eyes · PerceptionThe blind spot
At the point where the optic nerve exits, there are no photoreceptors; the brain fills in the gap.
Frequency: Common
Eyes · PerceptionAfterimages
After looking at a vivid color field, a short-lived afterimage in another, roughly opposite color can appear.
Frequency: Common
Eyes · PerceptionLight without light
Phosphenes are sensations of light without a corresponding external light source; they can arise in different parts of the visual system.
Frequency: Varies by individual
Eyes · PerceptionBright dots in the blue field
Against a blue sky, tiny bright dots can move along winding paths.
Frequency: Varies by individual
Eyes · PerceptionThe fading surroundings
With steady fixation, low-contrast stationary stimuli can gradually fade from perception.
Frequency: Varies by individual
Eyes · PerceptionThe waterfall moves backward
After looking at movement for a while, a stationary pattern seems to flow in the opposite direction.
Frequency: Varies by individual
Eyes · Perception3D from two images
The brain combines the slightly different images from both eyes into depth perception.
Frequency: Common
Eyes · ReflexPupillary light reflex
Bright light automatically constricts the pupil; darkness makes it enlarge again.
Frequency: Common
Eyes · ReflexReflex tearing
Smoke, onions, or dry air irritate the eye surface and trigger tears. This reflex protects and rinses the cornea.
Frequency: Common
Eyes · Involuntary responseGustatory lacrimation
Rarely, the eyes water during chewing or eating.
Frequency: RareSurprisingly quiet here.
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