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Encyclopedia > Sclera
Schematic diagram of the human eye.
Schematic diagram of the human eye.

The sclera is the opaque (usually white), fibrous, protective layer of the eye containing collagen and elastic fibers.[1] In children, it is thinner and shows some of the underlying pigment, appearing slightly blue. In the old, however, fatty deposits on the sclera can make it appear slightly yellow. Image File history File links Schematic_diagram_of_the_human_eye_with_English_annotations. ... Image File history File links Schematic_diagram_of_the_human_eye_with_English_annotations. ... The human eye. ... Tropocollagen triple helix. ... Elastic fibers (or yellow fibers) are bundles of proteins (elastin) found in connective tissue and produced by fibroblasts and smooth muscle cells in arteries. ...


Diseases and disorders

There are some diseases like scleritis that cause partial blindness. These diseases produce a dark vertical line through the eye sight which cause less than 100% visibility. This is a partial list of human eye diseases and disorders. ... Scleritis is a serious inflammatory disease that affects the white outer coating of the eye, known as the sclera. ... Blindness is the condition of lacking visual perception due to physiological or psychological factors. ...


References

  1. ^ Cassin, B. and Solomon, S. Dictionary of Eye Terminology. Gainsville, Florida: Triad Publishing Company, 1990.
Sensory system - Visual system - Eye - edit
Fibrous tunic: Conjunctiva | Sclera | Cornea | Schlemm's canal | Trabecular meshwork 

Uvea: Choroid | Iris | Pupil | Ciliary body  This article or section may be confusing for some readers, and should be edited to be clearer or more simplified. ... The visual system is the part of the nervous system which allows organisms to see. ... The human eye. ... The sclera and cornea form the fibrous tunic of the bulb of the eye; the sclera is opaque, and constitutes the posterior five-sixths of the tunic; the cornea is transparent, and forms the anterior sixth. ... The conjunctiva is a membrane that covers the sclera (white part of the eye) and lines the inside of the eyelids. ... The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of an eyes optical power [1]. Together with the lens, the cornea refracts light and, as a result, helps the eye to focus. ... Schlemms canal, also known as canal of Schlemm, is a circular channel in the eye that collects aqueous humor from the anterior chamber and delivers it into the bloodstream . ... This is an area of tissue located around the base of the cornea, near the ciliary body, and is responsible for draining the aqueous humour from the eye via the anterior chamber (the chamber on the front of the eye covered by the cornea). ... For the Pacific island, see Wallis Island. ... Schematic cross section of the human eye; choroid is shown in yellow. ... The human iris The iris is the green/grey/brown area. ... The human eye The pupil is the central transparent area (showing as black). ... Schematic diagram of the human eye The ciliary body is the part of the eye containing the ciliary muscle and ciliary processes. ...


Retina : Macula | Fovea | Optic disc  Human eye cross-sectional view. ... Human eye cross-sectional view. ... The fovea, a part of the eye, is a spot located in the center of the macula. ... The optic disc or optic nerve head is the point in the eye where the optic nerve fibres leave the retina; it is not sensitive to light and thus also known as the blind spot or anatomical blind spot. Inspection of the optic disc by ophthalmoscopy can give an indication...


Anterior segment (Anterior chamber, Aqueous humour, Posterior chamber, Lens) | Posterior segment (Vitreous humour) anterior segment ... The anterior chamber if the fluid-filled space inside the eye between the iris and the corneas innermost surface, the endothelium . ... The aqueous humour is the clear, watery fluid that fills the complex space in the front of the eye which is bounded at the front by the cornea and at the rear by the front surface or face of the vitreous humour. ... The posterior chamber is a narrow chink behind the peripheral part of the iris, and in front of the suspensory ligament of the lens and the ciliary processes. ... Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. ... The posterior segment is the back two-thirds of the eye that includes the anterior hyaloid membrane and all structures behind it: the vitreous humor, retina, choroid, and optic nerve. ... Vitreous humour is the clear aqueous solution that fills the space between the lens and the retina of the vertebrate eyeball. ...

Sensory system - Visual system - edit
Eye | Optic nerve | Optic chiasm | Optic tract | Lateral geniculate nucleus | Optic radiation | Visual cortex


This article or section may be confusing for some readers, and should be edited to be clearer or more simplified. ... The visual system is the part of the nervous system which allows organisms to see. ... The human eye. ... The optic nerve is the nerve that transmits visual information from the retina to the brain. ... Visual pathway with optic chiasm circled The optic chiasm (from the Greek χλαζειν to mark with an X, after the letter Χ chi) is the part of the brain where the optic nerves partially cross, those parts of the right eye which see things on the right side being connected to the... The optic tract is a part of the visual system in the brain. ... Grays FIG. 719– Hind- and mid-brains; postero-lateral view. ... The geniculo-calcerine tract (known as the optic radiation) is a collection of axons carrying visual information from the lateral geniculate nucleus of the thalamus to the primary visual cortex (also called striate cortex). ... Visual cortex is the term applied to both the primary visual cortex (also known as striate cortex or V1) and upstream visual cortical areas also known as extrastriate cortical areas (V2, V3, V4, V5). ...

Muscles of orbit
Levator palpebrae superioris muscle - Superior rectus muscle - Inferior rectus muscle - Lateral rectus muscle - Medial rectus muscle - Superior oblique muscle - Inferior oblique muscle

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X. The Organs of the Senses and the Common Integument. 1c. 1. The Tunics of the Eye. Gray, Henry. 1918. Anatomy of the ... (5591 words)
869) form the fibrous tunic of the bulb of the eye; the sclera is opaque, and constitutes the posterior five-sixths of the tunic; the cornea is transparent, and forms the anterior sixth.
Its outer surface is loosely connected by the lamina suprachorioidea with the sclera; its inner surface is attached to the pigmented layer of the retina.
The circular fibers are internal to the meridional ones, and in a meridional section appear as a triangular zone behind the filtration angle and close to the circumference of the iris.
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