optic disc definition
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Where is the blind spot of the eye? Optic disc: The circular area in the back of the inside of the eye where the optic nerve connects to the retina. Also called the optic nerve head.
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- blind spot. The beginning of the optic nerve in the retina is called the optic nerve head or optic disc. Since there are no photoreceptors (cones and rods) in the optic nerve head, this area of the retina cannot respond to light stimulation. As a result, it is known as the blind spot, and everybody has one in each eye.ptic atrophy of the optic disc (visible to an eye doctor looking inside the eye) is the result of degeneration of the nerve fibers of the optic nerve and optic tract. It can be congenital (usually hereditary) or acquired.
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- Of various optic disc features, the vertical cup to disc ratio (CDR) is the most commonly used clinical measurement, particularly for the diagnosis of glaucoma. 1. Systemic and ocular processes may affect the CDR, and understanding these factors may improve the clinical assessment of this sign.
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optic disc the small blind spot on the surface of the retina, located about 3 mm to the nasal side of the macula. It is the point where the fibers of the retina leave the eye and become part of the optic nerve. It is the only part of the retina that is insensitive to light.
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- Optic disc: The circular area in the back of the inside of the eye where the optic nerve connects to the retina.
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optic foramen Medical Definition of optic foramen. : the passage through the orbit of the eye in the lesser wing of the sphenoid bone that is traversed by the optic nerve and ophthalmic artery—called also optic canal; see chiasmatic groove.
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Do You Need an Optical Disk Drive? Optical Disc Drive Description. An optical drive is a piece of computer hardware about the size of a thick soft cover book. The front of the drive has a small Open/Close button that ejects and retracts the drive bay door. This is how media like CDs, DVDs, and BDs are inserted into and removed from the drive.
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- Noun. 1. optic disc-the point where the optic nerve enters the retina; not sensitive to light. optic disk, blind spot. retina-the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve.
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optic-disc.org A 90D lens provides a wide field of view but less magnification in comparison to a +60D, which provides a narrower field of view but x1.15 magnification. It is this magnification and depth of field that makes the +60D lens a excellent choice for examining the optic disc ( and macular examination).
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- Optic Disc Photographs. Photographic images of the optic disc are essential for monitoring glaucoma. Glaucoma damage is seen clinically as loss of the nerve fiber layer and an associated thinning of tissue at the optic nerve head.With this damage, ophthalmologists (Eye M.D.s) look for what they call “cupping” of the optic nerve.ptic Disc Photographs. Photographic images of the optic disc are essential for monitoring glaucoma. Glaucoma damage is seen clinically as loss of the nerve fiber layer and an associated thinning of tissue at the optic nerve head.
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The Optic Nerve blind spot. The beginning of the optic nerve in the retina is called the optic nerve head or optic disc. Since there are no photoreceptors (cones and rods) in the optic nerve head, this area of the retina cannot respond to light stimulation. As a result, it is known as the blind spot, and everybody has one in each eye.
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Medical Definition of Optic nerve Optic nerve: The optic nerve connects the eye to the brain. The optic nerve carries the impulses formed by the retina, the nerve layer that lines the back of the eye and senses light and creates impulses. These impulses are dispatched through the optic nerve to the brain, which interprets them as images.Using an ophthalmoscope, the head of the optic nerve can be easily seen.ptic nerve: The optic nerve connects the eye to the brain. The optic nerve carries the impulses formed by the retina, the nerve layer that lines the back of the eye and senses light and creates impulses. These impulses are dispatched through the optic nerve to the brain, which interprets them as images.
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optic chiasma the disk in the fundus of the eye marking the point at which the optic nerve enters; it is accompanied by blood vessels, is oval, light in color and the blind spot of the retina. optic nerve. the second cranial nerve; it is purely sensory and is concerned with carrying impulses for the sense of sight.
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Medical Definition of Optic nerve The optic nerve carries the impulses formed by the retina, the nerve layer that lines the back of the eye and senses light and creates impulses. These impulses are dispatched through the optic nerve to the brain, which interprets them as images. Using an ophthalmoscope, the head of the optic nerve can be easily seen.
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Thin layer of tissue covering the front of the eye, except t Optic Nerve. The Optic Nerve, also called Cranial Nerve II, is the nerve that transmits visual information from the Retina to the Brain. Optic Disc. The Optic Disc or Optic Nerve head is the point in the eye where the optic nerve fibers leave the retina.Due to absence of light sensitive rods and cones of the retina at this point, it is not sensitive to light and thus is also known as The Blind Spot or Anatomical Blind Spot.he Optic Nerve, also called Cranial Nerve II, is the nerve that transmits visual information from the Retina to the Brain. Optic Disc. The Optic Disc or Optic Nerve head is the point in the eye where the optic nerve fibers leave the retina.
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Optic disc The optic disc or optic nerve head is the point of exit for ganglion cell axons leaving the eye.Because there are no rods or cones overlying the optic disc, it corresponds to a small physiological blind spot in each eye. The ganglion cell axons form the optic nerve after they leave the eye.The optic disc represents the beginning of the optic nerve and is the point where the axons of retinal ganglion cells come together. The optic disc is also the entry point for the major blood vessels that supply the retina.The optic disc in a normal human eye carries from 1 to 1.2 million neurons from the eye towards the brain.he optic disc is placed 3 to 4 mm to the nasal side of the fovea. It is a vertical oval, with average dimensions of 1.76mm horizontally by 1.92mm vertically. There is a central depression, of variable size, called the optic cup.
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optical disc optical disc. n. A plastic-coated disk on which data, such as text, music, or video, is digitally stored as microscopic regions of varying reflectivity and is read by scanning the surface with a laser. Also called laser disc.
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Chapter 15 Anatomy Review Questions The blind spot of the eye is the optic disc. It is the part of the retina where the optic nerve exits the eye and it is blind because it is a region of the retina that lacks photoreceptors. Sam's opteometrist tells him that his intraocular pressure is high.
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Optic neuropathy [edit on Wikidata] Optic neuropathy refers to damage to the optic nerve due to any cause. Damage and death of these nerve cells, or neurons, leads to characteristic features of optic neuropathy. The main symptom is loss of vision, with colors appearing subtly washed out in the affected eye. On medical examination, the optic nerve head can be visualised by an ophthalmoscope. A pale disc is characteristic of long-standing optic neuropathy. In many cases, only one eye is affected and patients may not be aware of the
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optic optic disk. the disk in the fundus of the eye marking the point at which the optic nerve enters; it is accompanied by blood vessels, is oval, light in color and the blind spot of the retina. optic nerve. the second cranial nerve; it is purely sensory and is concerned with carrying impulses for the sense of sight.The rods and cones of the retina are connected with the optic nerve which leaves the eye slightly to the nasal side of the center of the retina.ptic nerve the second cranial nerve; it is purely sensory and is concerned with carrying impulses for the sense of sight (see vision). See anatomic Table of Nerves in the Appendices.
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Medical Definition of Optic nerve The retina is the nerve layer that lines the back of the eye, senses light and creates impulses that travel through the optic nerve to the brain. The macula is a small area in the retina that contains special light-sensitive cells and allows us to see fine details clearly. The optic nerve is the nerve that connects the eye to the brain and carries the impulses formed by the retina to the visual cortex of the brain.
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How to Evaluate the Suspicious Optic Disc I also evaluate the optic nerve's color, noting if it's pink or pale. However, focusing solely on the disc color may lead to an underestimation of the C/D ratio, since the cup region is not where the nerve tissue is situated. The tissue in the rim is what becomes thinned in eyes with glaucoma. Thus, when evaluating the significance of the C/D ratio, it is first important to measure the actual size of the optic disc. To do this, I use the 78- or 90-D lens to measure the vertical and horizontal diameters of the optic disc with the slit beam.
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- Optic Disc & Optic Nerve. The optic disc is a round area in the back of the eye where retinal nerve fibers collect to form the optic nerve. The optic disc is sometimes called the optic nerve head because it is the head of the optic nerve as it enters the eye from the brain.It is located slightly to the nasal side of the globe.he optic disc: 1  Is the collection point of the nerve fiber layer as it exits the eye. 2  Is where the nerve fiber layer becomes the optic nerve. 3  Is where the central retinal artery enters the retina. 4  Is where the central retinal vein exits the retina.
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Optic Nerve Anatomy When the eye is open, light hits the retina and initiates nerve impulses that travel along the optic nerves to the visual centers of the brain. The spot on the retina where the optic nerve leaves the eye is called the optic disc.hen the eye is open, light hits the retina and initiates nerve impulses that travel along the optic nerves to the visual centers of the brain. The spot on the retina where the optic nerve leaves the eye is called the optic disc.
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Background Background. While papilledema is disc edema secondary to increased intracranial pressure, pseudopapilledema is apparent optic disc swelling that simulates some features of papilledema but is secondary to an underlying, usually benign, process.
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Optic tract The optic tract (from the Latin tractus opticus) is a part of the visual system in the brain. It is a continuation of the optic nerve that relays information from the optic chiasm to the ipsilateral lateral geniculate nucleus (LGN) , pretectal nuclei, and superior colliculus. lesion in the left optic tract will cause right-sided homonymous hemianopsia, while a lesion in the right optic tract will cause left-sided homonymous hemianopsia. Stroke, congenital defects, tumors, infection, and surgery are all possible causes of optic tract damage.