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The human eye is a sensory organ in the visual system that reacts to visible light allowing eyesight. Other functions include maintaining the circadian rhythm, and keeping balance. Arizona Eye Model. "A" is accommodation in diopters. The eye can be considered as a living optical device.
The compound eyes of the arthropods are composed of many simple facets which, depending on anatomical detail, may give either a single pixelated image or multiple images per eye. Each sensor has its own lens and photosensitive cell(s). Some eyes have up to 28,000 such sensors arranged hexagonally, which can give a full 360° field of vision.
Galena eye paint (later termed Kohl in Arabic from the Akkadian word for the cosmetic) was widely applied in ancient Egypt. Upper eyelids were painted black and lower ones were colored green, as depicted in ancient texts that describe the use of both black galena and green malachite.
Human eye pigmentation in Europe Among human phenotypes, blue-green-gray eyes are a relatively rare [citation needed] eye color and the exact color is often perceived to vary according to its surroundings. The iris is usually strongly pigmented, with the color typically ranging between brown, hazel, green, gray, and blue.
An example of eye movement over a photograph over the span of just two seconds. Eye movement includes the voluntary or involuntary movement of the eyes. Eye movements are used by a number of organisms (e.g. primates, rodents, flies, birds, fish, cats, crabs, octopus) to fixate, inspect and track visual objects of interests.
Rostral and caudal, which describe structures close to (rostral) or farther from (caudal) the nose. For example, the eyes are rostral to the back of the skull, and the tailbone is caudal to the chest. Cranial and caudal, which describe structures close to the top of the skull (cranial), and towards the bottom of the body (caudal).
Butterfly kissing, getting an eye close to another person's eye and fluttering the eyelids rapidly; used to express love. Cut-eye, gesture of condemnation in Jamaica and some of North America. [46] Eyebrow raising. In Marshall Islands culture, briefly raising the eyebrows is used to acknowledge the presence of another person or to signal assent ...
3 Of the digimon sovereigns have 4 eyes on their heads from Digimon. Huanlongmon has 8 eyes from Digimon. Rachnera Arachnera from Monster Musume has six eyes, being part spider. Pai, a Sanjiyan Unkara from the manga 3×3 Eyes. Thousand-Eyes Idol from Yu-Gi-Oh!. Alucard's familiar, "Black hound of Baskerville" in Hellsing Ultimate. Claydol, from ...