Home > Terms > English, UK (UE) > Pupil

Pupil

Appears as a small black dot in the centre of the iris. The pupil changes its diameter in response to changes in ambient lighting. The pupil varies the amount of light reaching the retina and the depth of focus of the eye.

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Related terms

pupil
Biology; Neuroscience

The perforation in the iris that allows light to enter the eye.

pupil
Anatomy; Surface anatomy

The opening in the center of the iris through which light enters the eye is called as pupil.

pupil
Health care; Optometry

The round, dark center of the eye, which opens and closes to regulate the amount of light the retina receives.

pupil
Health care; Cancer treatment

The round opening in the center of the iris (the colored tissue that makes the "eye color" at the front of the eye). The pupil changes size to let light into the eye. It gets ...

pupil
Animals; Birds

The pupil is the dark circular, hollow passage in the middle of the iris through which the light enters the eye and forms an image on the back of the eye.

pupil
Health care; General

The opening in the center of the iris.

ophthalmoscope
Eyewear; Optometry

An optical instrument used to examine the external and internal parts of the eye, particularly the media and the fundus.

pantoscopic angle
Eyewear; Optometry

1. Angle in the vertical plane between the optical axis of a spectacle lens and the visual axis of the eye in the primary position, usually taken to be the horizontal. 2. Angle ...

optical material
Eyewear; Optometry

Transparent material capable of being manufactured into optical components.

optical radiation hazard
Eyewear; Optometry

Possibility of damage to the retina by optical radiation.

optical centre
Eyewear; Optometry

For practical purposes, the intersection of the optical axis with the front surface a lens.

ophthalmoscope
Optometry; Optometry

An optical instrument used to examine the external and internal parts of the eye, particularly the media and the fundus.

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