TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

OPTIC DISC [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2017-07-12

English

Subject field(s)
  • The Eye
CONT

Pupil contraction is caused by excitation of the circular pupillary constriction muscle innervated by the parasympathetic fibers.

CONT

Optic nerve atrophy is characterized by a decrease in visual acuity, a lessening of pupillary contraction, and pallor in the optical disc.

Key term(s)
  • contraction of the pupil

French

Domaine(s)
  • Oeil
CONT

La contraction et la dilation de l'iris sont contrôlées par deux muscles antagonistes : le muscle sphincter pupillaire et le muscle [dilatateur] de la pupille. Ainsi, quand on parle de «pupille dilatée», il s'agit en fait d'une dilatation de l'iris due à un relâchement du muscle sphincter et une contraction du muscle dilatateur. Réciproquement, la contraction de la pupille est causée par une contraction du muscle sphincter.

Spanish

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Record 2 2013-07-18

English

Subject field(s)
  • The Eye
CONT

A funduscopic exam should include an assessment of the optic nerve head or disc, the retinal vessels, and the macula.

Key term(s)
  • fundi exam

French

Domaine(s)
  • Oeil
CONT

L'optométriste effectuera un examen du fond de l’œil avec dilatation des pupilles (examen du vitré et de la rétine avec un équipement spécial après avoir administré des gouttes pour agrandir les pupilles).

Spanish

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Record 3 2012-12-05

English

Subject field(s)
  • Visual Disorders
DEF

A depression in the optic nerve head.

OBS

It may be physiological, confined to the centre of the disc; glaucomatous, extending to the edge of the disc and often deep with overhanging edges; postatrophic, shallow and saucer-like; or cavernous, very deep and thought to be arteriosclerotic in nature, as it is not associated with raised tension.

OBS

The term "cupping of the optic disc" was recommended by the Medical Signs and Symptoms Committee.

French

Domaine(s)
  • Troubles de la vision
DEF

Modification pathologique de la papille optique survenant essentiellement lors de l'évolution du glaucome.

OBS

À différencier de l'excavation papillaire physiologique qui est de petite dimension et de faible profondeur.

Spanish

Campo(s) temático(s)
  • Trastornos de la visión
DEF

Depresión pálida tridimensional en el centro de la cabeza del nervio ópticoque no está ocupada por tejido neural del disco.

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Record 4 2012-07-05

English

Subject field(s)
  • The Eye
DEF

A pathway within the vitreous extending from optic disc to lens.

French

Domaine(s)
  • Oeil
DEF

Canal du corps vitré s'étendant de la papille optique au cristallin.

Spanish

Campo(s) temático(s)
  • Ojo
Save record 4

Record 5 2001-08-20

English

Subject field(s)
  • Measuring Instruments (Engineering)
  • Optics
  • Navigation Instruments
CONT

A more advanced type of gyro is the optical gyroscope. These devices are based on two counter-rotating beams of light travelling in a ring-like structure. The interaction of the two light beams produces a standing wave pattern. If the ring is then rotated about its centre axis (think of a torus spinning around its core), one of the beams has to travel a slightly longer distance, and the other a slightly shorter distance to get back to where they started. This will cause a shift in the pattern of the standing wave, and this can be measured to determine the rate of rotation.

CONT

Most people would remember the classic rotating disc gyroscope, which belongs to the mechanical group. One of today's high precision gyros is still the mechanical, rotating gyro; however it is dependent on linear accelerations because of its mechanical measuring principle. The optical group comprises the fibre optic-and laser types. These use the Sagnac Effect(named after its French discoverer), which, when the sensor is turned, results in a difference in transit time between two light waves passing through the same optical path but in opposite directions. Optical gyros therefore do not depend on acceleration as gyros in the mechanical group. This is one of their biggest advantages...

French

Domaine(s)
  • Instruments de mesure (Ingénierie)
  • Optique
  • Instruments de navigation
CONT

Réaliser un gyroscope optique d'un prix de revient de quelques centaines de francs. Voilà une prouesse technologique quand on sait que les systèmes actuels, les gyroscopes laser, coûtent entre 100 000 francs et 1 million de francs. La solution mise au point par Mohamed Bouamra, chercheur à l'École nationale supérieure de physique de Strasbourg, tient à une habile substitution de technologies : une simple diode électroluminescente remplace le laser, tandis que des banales fibres optiques multimodes prennent la place des coûteuses fibres monomodes.

CONT

[...] certains laboratoires ont étudié divers dispositifs de mesure des rotations absolues ne présentant qu'une analogie assez lointaine avec les gyroscopes classiques. Ce sont les gyroscopes à vibrations [...]; les gyroscopes nucléaires [...]; les gyroscopes optiques, exploitant les propriétés de la lumière cohérente [...]

Spanish

Save record 5

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