definition
An eye.
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A lens or other part of an optical instrument that interacts with light.
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A measuring device with a small window, attached to an upside-down bottle, used to dispense alcoholic drinks in a bar.
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Of, or relating to the eye or to vision.
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Of, or relating to optics or optical instruments.
In many cases the stand is also movable round the optic axis.
Airy extended Fresnel's hypothesis to directions inclined to the axis of uniaxal crystals by assuming that in any such direction the two waves, that can be propagated without alteration of their state of polarization, are oppositely elliptically polarized with their planes of maximum polarization parallel and perpendicular to the principal plane of the wave, these becoming practically plane polarized at a small inclination to the optic axis.
This is a plate made of two equal wedges of quartz, that can be moved over one another so as to vary its thickness, and are cut so that the faces of the plate are parallel to the optic axis, which in the first wedge is perpendicular and in the second is parallel to the refracting edge.
On these principles Airy, by an elaborate mathematical investigation, successfully explained the interference patterns obtained with plates of quartz perpendicular to the optic axis.
This refractive index should be equal to the greatest index of the plate, and with a biaxal plate the mean axis of optical symmetry should be parallel to its faces and in the normal section of the prisms, while with an uniaxal plate the optic axis should be in a plane perpendicular to this normal section.
If, by these methods, a point in the optic axis has been freed from aberration, it does not follow that a point situated only a very small distance from the optic axis can also be represented without spherical aberration.
To examine crystals, especially in converging light, a condenser, movable in the optic axis, is needed above the polarizer.
Foramina by which the optic, trigeminal and portio dura, and abducens nerves leave the skull.
He has bilateral optic nerve atrophy, which affects the visual information passing from the eye to the brain.
The fiber optic servo bus allows the system's " almost dumb " servo amplifiers to be up to 100m apart.
Another key factor of modern fiber optic systems that we have not touched on is optical amplifiers.
Toxicities included transient periorbital edema in four eyes and optic atrophy in one eye that also received laser photocoagulation and cryotherapy.
Liquid anisotropic etching of silicon enables the accurate fabrication of V-shaped grooves to locate optic fibers.
More commonly it is also called an optic chiasm glioma.
The lobes of the cerebral hemisphere, optic nerves, arachnoid granulations and blood vessels are all identified.
His interests in the fiber optic sensors field include fiber optic chemical sensors, and, in particular, fiber grating sensors.
Some people may know the visual side alone as optic nerve hypoplasia.
Fiber optic illuminator with focusing lens, brackets and trolley.
Further development of this device to make it commercially marketable is possible, and research into similar fiber optic devices is envisaged.
The anatomy of the visual pathway The optic nerves carry visual signals from each eye into the head.
The optic nerve is made up of thousands of nerve fibers.
Despite the large number of the optic nerve fibers their capacity of plasticity for to achieve recovery is rather limited.
A randomized trial of intravenous immunoglobulin in inflammatory demyelinating optic neuritis.
However, in eyes with established glaucomatous optic neuropathy at diagnosis, iridotomy failed in 47% .
Sometimes children with optic neuropathy find spectacles improve vision.
The joined up path that signals travel down from retina to optic nerve then optic chiasm then occipital lobe is called the visual pathway.
A thin fiber optic cable is needed to connect the two.
This axis of symmetry is called the optic axis.
The wires joining each eye to the brain are called the optic nerves.
A really high pressure will damage the optic nerve immediately.
In the visual pathway the fibers of the retinal ganglion cells form the optic nerve.
The left optic nerve also enhanced (not shown ).
Fiber optic devices for cross section converters The complete range of fiber optics can be connected to amplifiers with analog outputs.
The Mr Fantastic Deluxe playsuit is a one piece polyester playsuit with fiber optic flashing badge.
Endoscopic orbital decompression may be used to treat disfiguring proptosis or sight threatening optic nerve compression in patients with thyroid eye disease.
They are also compatible with fiber composite hosts and there is a potential of embedding the fiber optic sensor relatively unobtrusively within the host.
Their experience in selling fiber optic based spectrometers makes them ideally placed to promote the nkd in the Japanese market.
Cavefish have evolved regressive characters such as a degenerate eye, small optic tectum, and less pigment.
The Optic System is a 300mm Acrylic lens with a 250 watt tungsten lamp controlled by an electronic flasher.
Their transverse dorsal connexion is the posterior commissure; otherwise the whole roof portion of the midbrain is reduced to a thin membrane, continuous with that which covers the Sylvian aqueduct, and this ventricle sends a lateral cavity into each optic lobe, as is the case in reptiles.
The acute bisectrix of the optic axes never deviates from the normal to the basal plane by more than a degree or two, hence a cleavage flake of mica will always show an optic figure in convergent light when placed on the stage of a polarizing microscope.
The examination of dispersion of the optic axes in biaxal crystals (see Refraction, § Double) may be conveniently made with a plate perpendicular to the acute bisectrix placed in the diagonal position for light of mean period between a crossed polarizer and analyser.
Children over 3 will love this colorful collaboration by York Theater Royal, tutti frutti and international puppetry artists, Faulty Optic.
One of the leading causes of vision loss among senior citizens is the progressive, irreversible damage caused to the optic nerve by glaucoma.
A naso-pharyngeal exam using a fiber optic camera that fits into the nasal cavity to explore possible structural problems or obstructions.
The examination may include an x-ray of the skull or a small fiber optic camera used to evaluate the nasal cavity and throat.
Go Optic sells various styles of Saki eyewear in addition to the Saki 710 frame.
Specially speaking, the Silhouette 8067 offered at Go Optic comes in two different styles.
Based in San Diego County, California, Spy Optic is in a perfect location for sports enthusiasts of all kinds.
Spy Optic has developed a number of advancements in sun protection.
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