The round hole in the centre of the iris that corresponds to the lens aperture in a camera The pupil varies in size according to whether the environment is bright (small pupil) or dark (large pupil)
The black empty space located at the center of the eye A normal pupil will shrink when a light is directed into it and should enlarge in the dark The pupil should also constrict or shrink when focused on a near object This is controlled by muscles located in the iris
Appears as a small black dot in the center 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
The pupil is the opening in the middle of the iris It functions like the diaphragm in a camera, controlling the amount of light that enters the eye The pupil is small in bright light and large in dim light
A 2/3 pupil stop used to block the portion of the wavefront originating from the outer 1/3 of the HST primary mirror, reducing the deleterious effects of spherical aberration
a hole in the center of the iris that changes size in response to changes in lighting It gets larger in dim lighting conditions and gets smaller in brighter lighting conditions
the adjustable opening at the center of the iris that allows variable amounts of light into the eye The pupil will expand or dilate in response to low light conditions in an attempt to bring more light into the eye and will reduce in size when intense light is present
The pupil is the black dot in the center of your eye All the light you see comes through the pupil It actually isn't black; it just looks that way because there isn't any light coming out of it In fact, "red eye" in photographs is caused when light is reflected off the retina, shining outward through the pupil
The small dark portion in the center of the eye, the pupil opens and closes to regulate the amount of light, and thus the amount of visual information, the retina receives
Often compared with the shutter of a camera, the pupil is the black, circular "hole" in the iris that regulates the amount of light entering the eye The pupil appears black and the contents beyond it dark because of the absence of light inside the eye, similar to the way a dark room looks when viewed from a lighted one By using a special instrument called an ophthalmoscope, eye doctors are able to examine the inside of the eye
is the dark aperture in the iris that lets light into the eye The size of the pupil is changed by the muscles in the iris It is widened, (dilated) to let more light in and narrowed (constricted) to let less light through
A pupil of a painter, musician, or other expert is someone who studies under that expert and learns his or her skills. After his education, Goldschmidt became a pupil of the composer Franz Schreker