Optic Sentence Examples
In many cases the stand is also movable round 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.
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.
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.Advertisement
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.Advertisement
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.Advertisement
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.
There is a private 28 ft pool with fiber optic colored lighting, extended deck and covered lanai.
Further development of this device to make it commercially marketable is possible, and research into similar fiber optic devices is envisaged.Advertisement
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% .Advertisement
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.
They offer something called an "Optic Control System" which allows for interchangeable protection for both court and off-court activities.
Go Optic has a selection of Wrangler frames, too.
If you plan to shop online, check out Vizio Optic and Optical Effects.
If you prefer to shop online, sites such as Frames Direct, Go Optic and Eyeglass Direct sell a range of magnetic eyeglass frames as well.
Tumors along the optic nerve, causing vision disturbances in about 20 percent of those affected.
Other photo-therapy methods-such as a fiber optic bilirubin blanket-incorporate the light into a blanket so that the child can be breastfed during treatment or treated at home.
The retina transforms the image it receives into electrical signals that are sent to the brain via the optic nerve.
Small surgical openings are made in the uterus, and a tiny fiber optic fetoscope is inserted to guide the operation.
Fetoscope-A fiber optic instrument for viewing the fetus inside the uterus.
The job of the retina is to transform the light into information that can be transmitted to the optic nerve, which will transmit this information to the brain.
Some centers may use chemotherapy in place of radiation therapy when the tumors are too large to be treated by local therapies or are found over the optic nerve of the eye.
Optic nerve-A bundle of nerve fibers that carries visual messages from the retina in the form of electrical signals to the brain.
Incomplete development of the optic (sight) and olfactory (smell) nerves often accompany the brain defects described above.
Sometimes a lighted, flexible fiber optic instrument (sigmoidoscope) may be inserted rectally in conjunction with a barium enema to visualize the bowel.
Glaucoma-A common eye disease characterized by increased fluid pressure in the eye that damages the optic nerve, which carries visual impulses to the brain.
In a laryngoscopy, a slender, flexible tube containing a fiber optic camera is inserted through the nose and down the throat to the larynx.
This leads to increased pressure within the eye and eventual damage to the optic nerve.
However, children with Lyme disease frequently complain of chest pain and have papilledema (swelling of the optic nerve).
The physician may perform a bronchoscopy, a visual examination in which the airways and lungs are seen through a fiber optic tube inserted down the person's windpipe (trachea).
You should also avoid B12 if you suffer from Leber's disease as supplementation could lead to serious damage to the optic nerve including blindness.
If the tutu isn't your kid's style, there are also the Prestige version and the Magic Lights version, with fiber optic touches.
They are available in small and large and in pebbled leather, jacquard, or optic fabric.
The Optic Signature Diaper Bag is currently the only available style, but this bag can do it all, while looking completely gorgeous.
Add this is the fact that DSL isn't available everywhere, won't work with fiber optic cables and its Caveat Emptor.
Forwards it covers, and has driven asunder, the optic lobes; backwards it hides the much shortened medulla oblongata.
Another cartilage or ossification, the posterior sclerotic ring, occurs within the walls of the posterior portion of the cup, and surrounds, especially in the Pici and in the Passeres, the entrance of the optic nerve.
From near the entrance of the optic nerve, through the original choroidal fissure, arises the much-folded pecten, deeply pigmented and very vascular, far into the vitreous humour.
The quadrate muscle adjusts the motion, and prevents pressure upon the optic nerve; during the state of relaxation of both muscles the nictitans withdraws through its own elasticity.
These dorsal eyes are very perfect in elaboration, possessing lens, retinal nerve-end cells, retinal pigment and optic nerve.
To the first class, with the optic axial plane perpendicular to the plane of symmetry, belong muscovite, lepidolite, paragonite, and a rare variety of biotite called anomite; the second class includes zinnwaldite, phlogopite, lepidomelane and most biotites.
The lateral eyes are in Limulus " compound eyes," that is to say, consist of many lenses placed close together; beneath each lens is a complex of protoplasmic cells, in which the optic nerve terminates.
But they also receive the nerve fibres of the optic nerve.
Thus light, pressure, or mechanical stimulation acting on the retina and optic nerve invariably produces luminous impressions.
Then with an uniaxal plate perpendicular to the optic axis, the black cross is replaced by two lines, on crossing which the rings are discontinuous, expansion or contraction occurring in the quadrants that contain the axis of the quarter-wave plate, according as the crystal is positive or negative.
When the light is circularly polarized or circularly analysed, a single plate gives two mutually enwrapping spirals, and similar spirals in circularly polarized light are obtained with plates of an active biaxal crystal perpendicular to one of the optic axes.
Wollaston, by blocking off one of the streams with a screen, sufficient lateral separation being obtained by combining two equal crystalline prisms cut differently with respect to the optic axis - an arrangement that achromatizes more or less completely the pencil that is allowed to pass.
With the .orthogonal arrangement for illuminating and observing the beam of light traverses an extremely fine slit through a well-corrected system, whose optic axis is perpendicular to the axis of the microscope; the system reduces the dimensions of the beam to about 2 to 4 in the focal plane of the objective.
It is essential that the objective is always brought before the lower end of the tube in such a way that the optic axis of the objective coincides with the optic axis of the rest of the system.
Whatever the working environment we can deliver structured cabling (Cat5e & Cat6 copper ), fiber optic backbone cabling.
In an area called the Optic chiasm, the nerves join and then separate.
Glaucoma was diagnosed if matching visual field and optic disk cupping were present, without reference to intraocular pressure (IOP) level.
Precision Acoustics are funding the development of a fiber optic hydrophone.
He was able to maintain his strenuous habits of study till he reached the advanced age of seventy-two, when he was, forced, by paralysis of the optic nerve, to give up work almost.
When, for instance, the axons of the ganglion cells of the retina are severed by section of the optic nerve, and thus their influence upon the nerve cells of the visual cerebral centres is set aside, the nerve cells of those centres undergo secondary atrophy (Gadden's atrophy).
The optic figure seen in convergent polarized light through a section cut parallel to the plane of symmetry of a borax crystal is symmetrical only with respect to the central point.
One, the quadratus or bursalis muscle, arises from the hinder surface of the eyeball, and forms with its narrow margin, which is directed towards the optic nerve, a pulley for the long tendon of the pyramidalis muscle.
Hickson and others, that in the bivalves Pecten and Spondylus, which also have eyes upon the mantle quite distinct from typical cephalic eyes, there is the same relationship as in Oncidiidae of the optic nerve to the retinal cells.
They are at the same time both optic nerve-end cells, that is to say, retina cells, and corneagen cells or secretors of the chitinous lens-like cornea.
The loss of an eye will be followed by atrophy of the optic nerve; the tissues in a stump of an amputated limb show atrophic changes; a paralysed limb from long disuse shows much wasting; and one finds at great depths of the sea fishes and marine animals, which have almost completely lost the organs of sight, having been cut off for long ages from the stimuli (light) essential for these organs, and so brought into an atrophic condition from disuse.
In a small commonplace book, bearing on the seventh page the date of January 1663/1664, there are several articles on angular sections, and the squaring of curves and " crooked lines that may be squared," several calculations about musical notes, geometrical propositions from Francis Vieta and Frans van Schooten, annotations out of Wallis's Arithmetic of Infinities, together with observations on refraction, on the grinding of " spherical optic glasses," on the errors of lenses and the method of rectifying them, and on the extraction of all kinds of roots, particularly those " in affected powers."
Crossed, inclined and horizontal dispersion are characterized respectively by a distribution of colour that is symmetrical with respect to the centre alone, the plane of the optic axes, and the perpendicular plane.
In the case of a biaxal plate perpendicular to the bisector of the acute angle between the optic axes, the curves of constant retardation are approximately Cassini's ovals, and the lines of like polarization are equilateral hyperbolae passing through the points corresponding to the optic axes.
When the rings are coloured symmetrically with respect to two perpendicular lines the acute bisectrix and the plane of the optic axes are the same for all frequencies, and the colour for which the separation of the axes is the least is that on the concave side of the summit of the hyperbolic brushes.
If in the interference experiment with Fresnel's mirrors or biprism the slit be illuminated with white light that has passed through a polarizer and a quartz plate cut perpendicularly to the optic axis, it is found on analysing the light that in addition to the ordinary central set of coloured fringes two lateral systems are seen, one on either side of it.
Soda light, first sifted by passage through a plate of potassium bichromate, traverses in succession a lens, a Nicol's prism, and a glass plate half covered with a half-wave plate of quartz, that is cut parallel to the optic axis and has its principal section inclined at a small angle to that of the prism.
The midbrain is represented chiefly by the optic lobes, the cortex of which alone is homologous with the corpora quadragemina of the mammals.
Curiously enough, however, they differ from the cephalic Molluscan eye in the fact that, as in the vertebrate eye, the filaments of the optic nerve penetrate the retina, and are connected with the re surfaces of the nerve-end cells nearer the lens instead of with the opposite end.
The plane of the optic axes may be either perpendicular or parallel to the plane of symmetry of the crystal, and according to its position two classes of mica are distinguished.
In the following year he discovered the change, produced by change of temperature, in the direction of the optic axes of selenite.
William Molyneux, in his Dioptrica Nova (1692), p. 256, declares his opinion that Roger Bacon (who died c. 12 9 4) "did perfectly well understand all kinds of optic glasses, and knew likewise the method of combining them so as to compose some such instrument as our telescope."
One of the most puzzling features in its structure, and, at the same time, one of the greatest obstacles to the view that it is essentially primitive and not merely a degenerate creature, is the entire absence of the paired organs of special sense, olfactory, optic and auditory, which are so characteristic of the higher vertebrates.
The optical characters are interesting, because of the striking crossed dispersion of the optic axes, of which phenomenon borax affords the best example.
In the Phyllopoda it consists mainly of two pairs of ganglionic centres, giving origin respectively to the optic and antennular nerves.
With a biaxal plate perpendicular to the optic axis in the diagonal position, the hyperbolic brush becomes an hyperbolic line and the rings are expanded or contracted on its concave side, with a positive plate, according as the plane of the optic axes is parallel or perpendicular to the axis of the quarter-wave plate, the reverse being the case with a negative plate.