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

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

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.

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

Read more here: » Closed eye hallucinations: Encyclopedia - Closed eye hallucinations

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

A cat's eye is a safety device used in road construction in the United Kingdom. It usually has some form of a retroreflective mechanism such as paint or a plastic corner reflector (Originally, these were glass spheres about 1 cm in diameter in a brass holder) built into a sturdy housing, capable of surviving as vehicles pass over it. In places where roads are subject to snow, they must also survive being drive ...

Including:

• Cat's eye road - Local practice
• Cat's eye road - United Kingdom
• Cat's eye road - Republic of Ireland

Read more here: » Cat's eye road: Encyclopedia - Cat's eye road

Cat's Eye (a.k.a. Stephen King's Cat's Eye) is a 1985 horror film directed by Lewis Teague and written by Stephen King. It is based on King's short stories The Ledge, Quitters, Inc., and The General (the former two appeared in his Night Shift story collection). The film is centered on a cat that is seeking out a young girl (played by Drew Barrymore) in order to save her from a supernatural danger. In the process of looking for her, the cat is a witness to other strange events, such as a ...

Including:

• Cat's Eye film - Awards
• Cat's Eye film - Technical data

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

Accommodation is the process by which the eye increases optical power to maintain a clear image (focus). See also. Accommodation reflex Accommodative esotropia Amplitude of accommodation Cycloplegia Edinger-Westphal nucleus Hermann von Helmholtz Lens (anatomy) Negative relative accommodation Positive relative accommodation Presbyopia ...

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

In most vertebrates and some mollusks the eye works by allowing light to enter it and project onto a light-sensitive panel of cells known as the retina at the rear of the eye, where the light is detected and converted into electrical signals, which are then transmitted to the brain via the optic nerve. Such eyes are typically roughly spherical, filled with a transparent gel-like substance called the vitreous humour, with a focusing lens and often an iris which regulates the intensity of the light that enters the eye. The eyes of cepha ...

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 - Varieties of eyes

In most vertebrates and some mollusks the eye works by allowing light to enter it and project onto a light-sensitive panel of cells known as the retina at the rear of the eye, where the light is detected and converted into electrical signals, which are then transmitted to the brain via the optic nerve. Such eyes are typically roughly spherical, filled with a transparent gel-like substance called the vitreous humour, with a focusing lens and often an iris which regulates the intensity of the light that enters the eye. The eyes of cephalopods, ...

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 - Varieties of eyes

Animals with compound eyes have a wide field of vision, allowing them to look in many directions. To see more, they have to move their entire head or even body. The visual system in the brain is too slow to process that information if the images are slipping across the retina at more than a few degrees per second (Westheimer and McKee, 1954). Thus, for humans to be able to see while moving, the brain must compensate for the motion of the head by turning the eyes. Another complication for vision in frontal-eyed animals is the developme ...

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 - Eye movement