An eye is an organ that detects light. Different kinds of light-sensitive organs are found in a variety of creatures. The simplest eyes do nothing but detect whether the surroundings are light or dark. More complex eyes are used to provide the sense of vision. Many complex organisms including some mammals, birds, reptiles and fish have two eyes which may be placed on the same plane to be interpreted as a single three-dimensional "image" (binocular vision), as in humans; or on different planes producing two separate "images" (monocular ...

Including:

• Eye - Varieties of eyes
• Eye - Evolution of eyes
• Eye - Anatomy
• Eye - Cytology
• Eye - Acuity
• Eye - Dynamic range
• Eye - Adnexa and related parts
• Eye - The orbit
• Eye - Eyebrows
• Eye - Eyelids
• Eye - Eyelashes
• Eye - Eye movement
• Eye - Rapid eye movement
• Eye - Saccades
• Eye - Microsaccades
• Eye - Vestibulo-ocular reflex
• Eye - Smooth pursuit movement
• Eye - Optokinetic reflex
• Eye - Vergence movement
• Eye - Accommodation
• Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia - Eye

Including:

• An eye for an eye - Lex talionis in Judaism
• An eye for an eye - Criticisms
• An eye for an eye - External references

Read more here: » An eye for an eye: Encyclopedia - An eye for an eye

In the Sermon on the Mount, Jesus of Nazareth urges his followers to turn the other cheek when confronted by violence: You have heard that it was said, "An eye for an eye and a tooth for a tooth". But I say to you, do not resist an evildoer. If anyone strikes you on the right cheek, turn to him the other also. (Matthew 5:38-39, NRSV) The passage continues with the importance of showing forgiveness to enemies and those who harm you. This saying of Jesus is frequently interpreted as criticism of the Old Testament tea ...

See also:

An eye for an eye, An eye for an eye - Lex talionis in Judaism, An eye for an eye - Criticisms, An eye for an eye - External references

Read more here: » An eye for an eye: Encyclopedia II - An eye for an eye - Criticisms

How a complex structure like the projecting eye could have evolved is often said to be a difficult question for the theory of evolution. Darwin famously treated the subject of eye evolution in his Origin of Species: To suppose that the eye, with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest possible ...

See also:

Eye, Eye - Varieties of eyes, Eye - Evolution of eyes, Eye - Anatomy, Eye - Cytology, Eye - Acuity, Eye - Dynamic range, Eye - Adnexa and related parts, Eye - The orbit, Eye - Eyebrows, Eye - Eyelids, Eye - Eyelashes, Eye - Eye movement, Eye - Rapid eye movement, Eye - Saccades, Eye - Microsaccades, Eye - Vestibulo-ocular reflex, Eye - Smooth pursuit movement, Eye - Optokinetic reflex, Eye - Vergence movement, Eye - Accommodation, Eye - Diseases disorders and age-related changes

Read more here: » Eye: Encyclopedia II - Eye - Evolution of eyes

A compound eye is a visual organ found in certain arthropods such as some insects and crustaceans. It consists of between 12 and 1,000 ommatidia which are tiny sensors that distinguish between brightness and darkness, and sometimes can detect color. The image perceived by the arthropod is a combination of inputs from the numerous ommatidia, which are oriented to point in slightly different directions. In contrast to other eye types, there is no central lens or retina, resulting in poor image resolution; however, it can detect fast move ...

Read more here: » Compound eye: Encyclopedia - Compound eye

The Bubble Eye is a variety of goldfish, characterized by the fluid-filled sacs it has underneath either eye. It is a 'fancy' variety, its unusual shape the result of many years of selective breeding. Like the ranchu, the bubble eye lacks a dorsal fin, and has a double tail. It occurs in a number of colors, including gold, red, black, white, red-and-white, and calico. Its eye sacs typically start small, and then grow as the fish does, partially occluding its vision. Bubble E ...

Including:

• Bubble Eye - Care
• Bubble Eye - History
• Bubble Eye - Links

Read more here: » Bubble Eye: Encyclopedia - Bubble Eye

Celestial Goldfish (scientific name Carassius auratus) is a fancy goldfish variety that first appeared in the 18th century. At the time it was kept as an 'exotic species' in fish bowls. They are the result of 600 years of selectively breeding goldfish, and do not grow to the usual size of fancy varieties. When the fry hatch they have normal eyes but over a matter of time these become bigger and then upturn. From above it appears as if they are looking up at you. Because of their limited eyesight they do not compete well ...

Read more here: » Celestial Eye: Encyclopedia - Celestial Eye

Cherry eye is the term used to refer to canine nictitans gland prolapse, a common eye condition in various dog breeds where the gland of the third eyelid prolapses and becomes visible. This condition usually must be corrected, mostly through surgery, because the gland produces some of the eye's tears. Older methods of cherry eye correction involved simply removing the gland, but it is a last-resort procedure today (complemented with a lifetime of eyedrops if performed), as the gland's purpose was unknown then. Modern methods of cherry ...

Including:

• Cherry eye - External link

Read more here: » Cherry eye: Encyclopedia - Cherry eye

Cat's Eye is a 1989 novel by Margaret Atwood. In it, painter Elaine Risley vividly reflects on her childhood and teenage years. Her strongest memories are of Cordelia, who was the leader of a trio of girls who were both very cruel and very kind to young Elaine, in ways that tint Elaine's perceptions of relationships and her world—not to mention her art—into the character's middle years. The novel unfolds in Canada of the mid-20th century, from World War II to the late 1980s, and includes a look at many of the cultural elements of that time peri ...

Read more here: » Cat's Eye novel: Encyclopedia - Cat's Eye novel

The Cat's Eye Nebula. Composite image using optical images from the HST and X-ray data from the Chandra X-ray Observatory The Cat's Eye Nebula (NGC 6543) is a planetary nebula in the constellation of Draco. Structurally, it is one of the most complex nebulae known, with high resolution Hubble Space Telescope observations revealing remarkable structures such as knots, jets and sinewy arc-like features. It was discovered by William Herschel on February 15, 1786, and was the first planetary nebula whose spectrum was investigated, by ...

Including:

• Cat's Eye Nebula - General information
• Cat's Eye Nebula - Observations
• Cat's Eye Nebula - Infrared observations
• Cat's Eye Nebula - Optical and ultraviolet observations
• Cat's Eye Nebula - X-ray observations
• Cat's Eye Nebula - Distance
• Cat's Eye Nebula - Age
• Cat's Eye Nebula - Composition
• Cat's Eye Nebula - Kinematics and morphology
• Cat's Eye Nebula - Open questions

Read more here: » Cat's Eye Nebula: Encyclopedia - Cat's Eye Nebula

Closed eye hallucinations or closed eye visualizations (CEV) is a term used to describe a distinct class of hallucination, which generally only occurs when one's eyes are closed, or one is in a darkened room. In particular, this is the primary form of hallucination encountered with the disassociative anaesthetic class of drugs, such as Ketamine, DXM and PCP. These compounds r ...

Including:

• Closed eye hallucinations - Level 1: The Visual Noise
• Closed eye hallucinations - Level 2: Light/Dark flashes
• Closed eye hallucinations - Level 3: Patterns motion and color
• Closed eye hallucinations - Level 4: Objects and Things
• Closed eye hallucinations - Level 5: Overriding physical perception
• Closed eye hallucinations - Image Burn-In
• Closed eye hallucinations - Protein Strings
• Closed eye hallucinations - Corneal Liquid
• Closed eye hallucinations - Blue-Sky Sprites

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Rapid eye movement (REM) is the stage of sleep characterized by rapid saccadic movements of the eyes. During this stage, the activity of the brain's neurons is quite similar to that during waking hours. Most of the vividly recalled dreams occur during REM sleep. It is the lightest form of sleep, and people awakened during REM usually feel alert and refreshed. REM sleep is so physiologically different from the other phases of sleep that ...

Including:

• Rapid eye movement - Physiology of REM sleep
• Rapid eye movement - Theories about the functions of REM sleep
• Rapid eye movement - REM sleep in other animals
• Rapid eye movement - History
• Rapid eye movement - Sources

Read more here: » Rapid eye movement: Encyclopedia - Rapid eye movement

The Eye of Horus (originally, The Eye of Ra) is an ancient Egyptian symbol of protection and power, from the deity Horus or Ra. See also. Eye of Providence: a symbol showing an eye surrounded by rays of light or a glory, and usually enclosed by a triangle Evil eye - widely distributed element of folklore Pyramids of Mars - an episode of Doctor Who in which the Eye of Horus is a device that imprisons Sutekh the Destroyer, last of the Osirans.

See also:

Eye of Sauron, Eye of Sauron - The Eye of Sauron in the books, Eye of Sauron - The Eye of Sauron in Peter Jackson's movies, Eye of Sauron - The Eye in Space?, Eye of Sauron - External link

Read more here: » Eye of Sauron: Encyclopedia II - Eye of Sauron - The Eye of Sauron in the books

Eye color - Brown eyes. The vast majority of the world's people have dark eyes, ranging from brown to nearly black. Light brown eyes are also present in many people, but to a lesser extent. Most of the original inhabitants of Africa, Asia, and the Americas have brown eyes. Brown eyes are also found in Europe, Oceania and North America, though within European populations they are not predominate to the same extent. In this population, brown eyes are genetically linked to brown or black hair. See also:

Eye color, Eye color - Colors, Eye color - Brown eyes, Eye color - Black eyes, Eye color - Hazel eyes, Eye color - Blue eyes, Eye color - Grey eyes, Eye color - Green eyes, Eye color - Blue-Green eyes, Eye color - Red eyes, Eye color - Heterochromia, Eye color - Genetics

Read more here: » Eye color: Encyclopedia II - Eye color - Colors

Eye color - Brown eyes. The vast majority of the world's people have dark eyes, ranging from brown to nearly black. Light brown eyes are also present in many people, but to a lesser extent. Most of the original inhabitants of Africa, Asia, and the Americas have brown eyes. Brown eyes are also found in Europe, Oceania , North America , though within European populations they are not predominate to the same extent. In this population, brown eyes are genetically linked to brown hair. [1] See also:

Eye color, Eye color - Colors, Eye color - Brown eyes, Eye color - Black eyes, Eye color - Hazel eyes, Eye color - Blue eyes, Eye color - Grey eyes, Eye color - Green eyes, Eye color - Blue-Green eyes, Eye color - Red eyes, Eye color - Heterochromia, Eye color - Genetics

Read more here: » Eye color: Encyclopedia II - Eye color - Colors