Eye - The orbit. In many species, the eyes are inset in the portion of the skull known as the orbits or eyesockets. This placement of the eyes helps to protect them from injury. Eye - Eyebrows. In humans, the eyebrows redirect flowing substances (usually rainwater) away from the eye. Water in the eye can alter the refractive properties of the eye and blur vision. It can also wash away the tear fluid, and its beneficial effects, and can damage the cornea, due to osmotic differences between tear fluid and freshwa ...

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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 - Adnexa and related parts

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 - Adnexa and related parts

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 ...

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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

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

Cyclopia. Cyclopia, a medical disorder characterized by the fusion of the orbits into a single cavity containing one eye. See Cephalic disorders. Cyclopia (genus), a plant genus. Other related archivesCephalic disorders, eye, orbits

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The sixth of twelve cranial nerves, the abducens nerve innervates the lateral rectus muscle and therefore controls each eye's ability to abduct (move away from the midline). The abducens nerve emerges from the ipsilateral abducens nucleus between the caudal pons beneath the floor of the fourth ventricle and the medulla (the pontomedullary junction). The abducens nerve exits the skull through the superior orbital f ...

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85 Io (eye'-oh) is a large and dark-colored Main belt asteroid. It is probably a primitive body composed of carbonates. Like 70 Panopaea it orbits within the Eunomia asteroid family but it is most likely not related to the shattered parent body. It was discovered by C. H. F. Peters on September 19, 1865 and named after Io, a lover of Zeus in Greek mythology. An Ionian diameter of 178 kilometres was measured from an occultation of a star on December 10, 1995. Io is also th ...

Including:

85 Io - Aspects

Read more here: » 85 Io: Encyclopedia - 85 Io

54 Piscium (abbreviated 54 Psc) is a 6th magnitude star in the constellation of Pisces. It is classified as a orange dwarf star (spectral class K0 V) and is somewhat less massive and luminous than our Sun. The star is relatively nearby, distance being only 36 light years. It is visible to the unaided eye under very good conditions. A planet was found orbiting the star in 2003. The star is also suspected to be ...

Including:

54 Piscium - 54 Piscium b 54 Piscium - 54 Piscium B?

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The Great Comet of 1882 (modern formal designation: C/1882 R1) was a comet which became very bright in September 1882. It was a member of the Kreutz Sungrazers, a family of comets which pass very close to the Sun's surface at perihelion. The comet was bright enough to be visible next to the sun in the daytime sky at its perihelion. Great Comet of 1882 - Discovery. The comet appeared suddenly in the morning skies in September 1882, and as it was already visible to the naked eye when it became visible ...

Including:

Great Comet of 1882 - Discovery Great Comet of 1882 - Perihelion Great Comet of 1882 - Post-perihelion evolution Great Comet of 1882 - Orbital studies

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83 Leonis (83 Leo) a wide binary star system in the constellation of Leo. It consist of two orange stars cooler than our Sun. The primary is a orange subgiant star, and the secondary is orange dwarf star. In 2005 a planet was announced orbiting the secondary star. 83 Leonis - 83 Leonis A. 83 Leonis A is a 6th magnitude star. It is not visible to the unaided eye, but easily visible with small binoculars. The star is classified as a subgiant meaning that it has ceased fusing hydrogen in i ...

Including:

83 Leonis - 83 Leonis A 83 Leonis - 83 Leonis B
83 Leonis - 83 Leonis Bb
83 Leonis - 83 Leonis C

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Comet Hale-Bopp (formally designated C/1995 O1) was probably the most widely observed comet of the 20th century, and one of the brightest seen for many decades. It was visible to the naked eye for a record 18 months, twice as long as the previous record holder, the Great Comet of 1811. Hale-Bopp was discovered on 23 July 1995 at a very large distance from the Sun, raising expectations that the comet could become very bright when it passed close to the Sun. Although comet brightnesses are very difficult to predi ...

Including:

Comet Hale-Bopp - Discovery Comet Hale-Bopp - Early progress Comet Hale-Bopp - Hale-Bopp becomes a Great Comet Comet Hale-Bopp - The comet recedes Comet Hale-Bopp - Orbital changes Comet Hale-Bopp - Scientific results
Comet Hale-Bopp - Sodium tail Comet Hale-Bopp - Deuterium abundance Comet Hale-Bopp - Organic species Comet Hale-Bopp - Rotation Comet Hale-Bopp - A satellite?
Comet Hale-Bopp - Paranoia and superstition Comet Hale-Bopp - Hale-Bopp's legacy

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(332,950 Earths) (27.9 g) The Sun (or Sol) is the star at the center of our Solar system. Earth orbits the Sun, as do many other bodies, including other planets, asteroids, meteoroids, comets and dust. Its heat and light support almost all life on Earth. The Sun is a ball of plasma with a mass of about 2×1030 kg, which is somewhat higher than that of an average star. About 74% of its mass is hydrogen, with 25% helium and the rest made up of trace quantities of heavier elements. It is thou ...

Including:

Sun - General information Sun - Structure
Sun - Core Sun - Radiation zone Sun - Convection zone Sun - Photosphere Sun - Temperature minimum Sun - Chromosphere Sun - Corona
Sun - Theoretical problems
Sun - Solar neutrino problem Sun - Coronal heating problem Sun - Faint young sun problem
Sun - Magnetic field Sun - Position of the Sun through the year Sun - Solar space missions Sun - History and future of the Sun Sun - Human understanding of the Sun Sun - The Sun as a power source Sun - Sun and eye damage

Read more here: » Sun: Encyclopedia - Sun

ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H00-H06 Disorders of eyelid lacrimal system and orbit. (H00) Hordeolum and chalazion (H000) Hordeolum and other deep inflammation of eyelid (H001) Chalazion (H01) Other inflammation of eyelid (H010) Blepharitis (H011) Noninfectious dermatoses of eyelid (H02) Other disorders of eyelid (H020) Entropion and trichiasis of eyelid (H021) Ectropion o ...

See also:

ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H00-H59 - Diseases of the eye and adnexa, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H00-H06 Disorders of eyelid lacrimal system and orbit, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H10-H13 Disorders of conjunctiva, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H15-H19 Disorders of sclera and cornea, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H20-H22 Disorders of iris and ciliary body, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H25-H28 Disorders of lens, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H30-H36 Disorders of choroid and retina, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H40-H42 Glaucoma, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H43-H45 Disorders of vitreous body and globe, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H46-H48 Disorders of optic nerve and visual pathways, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H49-H52 Disorders of ocular muscles binocular movement accommodation and refraction, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H53-H54 Visual disturbances and blindness, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H55-H59 Other disorders of eye and adnexa, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H60-H99 - Diseases of the ear and mastoid process, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H60-H62 Diseases of external ear, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H65-H75 Diseases of middle ear and mastoid, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H80-H83 Diseases of inner ear, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H90-H95 Other disorders of ear

Read more here: » ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process: Encyclopedia II - ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H00-H59 - Diseases of the eye and adnexa

ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H60-H62 Diseases of external ear. (H60) Otitis externa (H61) Other disorders of external ear (H62) Disorders of external ear in diseases classified elsewhere ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H65-H75 Diseases of middle ear and mastoid. (H65) Nonsuppurative otitis media (H66) Suppurative and unspecified otitis media (H ...

See also:

ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H00-H59 - Diseases of the eye and adnexa, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H00-H06 Disorders of eyelid lacrimal system and orbit, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H10-H13 Disorders of conjunctiva, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H15-H19 Disorders of sclera and cornea, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H20-H22 Disorders of iris and ciliary body, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H25-H28 Disorders of lens, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H30-H36 Disorders of choroid and retina, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H40-H42 Glaucoma, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H43-H45 Disorders of vitreous body and globe, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H46-H48 Disorders of optic nerve and visual pathways, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H49-H52 Disorders of ocular muscles binocular movement accommodation and refraction, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H53-H54 Visual disturbances and blindness, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H55-H59 Other disorders of eye and adnexa, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H60-H99 - Diseases of the ear and mastoid process, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H60-H62 Diseases of external ear, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H65-H75 Diseases of middle ear and mastoid, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H80-H83 Diseases of inner ear, ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H90-H95 Other disorders of ear

Read more here: » ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process: Encyclopedia II - ICD-10 Chapter H: Diseases of the eye adnexa ear and mastoid process - H60-H99 - Diseases of the ear and mastoid process

Eye examination - External examination. External examination of eyes consists of inspection of the eyelids, surrounding tissues and palpebral fissure. Palpation of the orbital rim may also be desirable, depending on the presenting signs and symptoms. The conjunctiva and sclera can be inspected by having the individual look up, and shining a light while retracting the upper or lower eyelid. The cornea and iris may be similarly inspected. < ...

See also:

Eye examination, Eye examination - Comprehensive eye examination, Eye examination - Case history, Eye examination - Entrance tests, Eye examination - Refraction, Eye examination - Functional tests, Eye examination - Health assessment, Eye examination - Setting, Eye examination - Basic examination, Eye examination - External examination, Eye examination - Visual acuity, Eye examination - Pupil function, Eye examination - Ocular motility, Eye examination - Visual field confrontation testing, Eye examination - Intraocular pressure, Eye examination - Ophthalmoscopy, Eye examination - Slit lamp

Read more here: » Eye examination: Encyclopedia II - Eye examination - Basic examination

The goal of investigation is the assessment of the severity of the ocular injury with an eye to implementing a management plan as soon as is required. The usual eye examination should be attempted, and may require a topical eye anesthetic in order to be tolerable. The first step is to assess the external condition of the eye and orbit, and check for perforations, hyphema, uveal prolapse, or globe penetration. If the pupil is teardrop-shaped, and the anterior chamber is flat, this is almost always a perf ...

See also:

Eye injury, Eye injury - Investigation, Eye injury - Emergency, Eye injury - Urgent, Eye injury - Semi-urgent, Eye injury - Management, Eye injury - Irrigation, Eye injury - Patching, Eye injury - Suturing

Read more here: » Eye injury: Encyclopedia II - Eye injury - Investigation

To maintain stereopsis and singleness of vision, the eyes need to be pointed accurately. The position of each eye in its orbit is controlled by six extraocular muscles. Slight differences in the length or insertion position or strength of the same muscles in the two eyes can lead to a tendency for one eye to drift to a different position in its orbit from the other, especially when one is tired. This is known as phoria. One way to reveal it is with the cover-uncover test. To do this test, look at a cooperative person's eyes. Cover one eye of ...

See also:

Binocular vision, Binocular vision - Fields of view and eye movements, Binocular vision - Binocular summation, Binocular vision - Binocular interaction, Binocular vision - Utrocular discrimination, Binocular vision - Singleness of vision, Binocular vision - Eye dominance, Binocular vision - Stereopsis, Binocular vision - Allelotropia, Binocular vision - Binocular rivalry, Binocular vision - Disorders of binocular vision, Binocular vision - Rembrandt as a person without binocular vision

Read more here: » Binocular vision: Encyclopedia II - Binocular vision - Disorders of binocular vision

On an interstellar scale, parallax created by the different orbital positions of the Earth causes nearby stars to appear to move relative to the more distant stars. However, this effect is so small it is undetectable without extremely precise measurements. The annual parallax is defined as the difference in position of a star as seen from the Earth and Sun, i.e. the angle subtended at a star by the mean radius of the Earth's orbit around the Sun. Given two points on opposite ends of the orbit, the parallax is half the maximum p ...

See also:

Parallax, Parallax - Introduction, Parallax - Use in distance measurement, Parallax - Parallax of the human eye, Parallax - Binocular parallax, Parallax - Monocular parallax, Parallax - Parallax and measurement instruments, Parallax - Photogrammetric parallax, Parallax - Lunar parallax, Parallax - Solar parallax, Parallax - Stellar parallax, Parallax - Computation, Parallax - Dynamic or moving-cluster parallax, Parallax - The scale of the Universe, Parallax - Parallax as a metaphor, Parallax - Sources

Read more here: » Parallax: Encyclopedia II - Parallax - Stellar parallax

Ceres is the largest known asteroid in the asteroid belt, which mostly lies between Mars and Jupiter. However the Kuiper belt is known to contain larger objects, including Pluto, 50000 Quaoar, 90482 Orcus, the recently discovered 2003 UB313, and possibly 90377 Sedna. At certain points in its orbit, Ceres can reach a magnitude of 7.0. This is generally regarded as being just barely too dim to be seen with the naked eye, but under exceptional viewing conditions a very sharp-sighted person may be able to see the asteroid with the naked eye. The only other aste ...

See also:

1 Ceres, 1 Ceres - Name, 1 Ceres - Discovery, 1 Ceres - Physical characteristics, 1 Ceres - Observations, 1 Ceres - Trivia, 1 Ceres - Aspects, 1 Ceres - External link

Read more here: » 1 Ceres: Encyclopedia II - 1 Ceres - Physical characteristics

In early times, astronomy only comprised the observation and predictions of the motions of the naked-eye objects. Aristotle said that the Earth was the center of the Universe and everything rotated around it in orbits that were perfect circles. Aristotle had to be right because people thought that Earth had to be in the center with everything rotating around it because the wind would not scatter leaves, and birds would only fly in one direction. For a long time, people thought that A ...

See also:

Astronomy, Astronomy - Divisions, Astronomy - By subject or problem addressed, Astronomy - Ways of obtaining information, Astronomy - History of astronomy, Astronomy - Timelines in astronomy, Astronomy - Astronomy tools

Read more here: » Astronomy: Encyclopedia II - Astronomy - History of astronomy