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It depends on how much light your eyes receive, in dark places or when you close your eyes your pupils dilate (mydriasis) to increase the ammount of light they can take in, conversely, when looking at an intense light the pupils contract (miosis) to decrease the ammount of light. This is called the photomotor reflex and involves the sympathic (mydriasis) and parasympathic (miosis) nervous pathways.
Wiki User
∙ 11y ago
Wiki User
∙ 15y agoThis happens because the muscles in the iris (the coloured part) close in to make the pupil smaller when there is to much light to protect the little cells in your eyes. It also happens vice versa to make the pupil bigger when there is little amount of light.
Wiki User
∙ 16y agoAs it gets darker, pupils get bigger. (They also get bigger when viewing something the person likes)
Wiki User
∙ 12y agoOk your eyes open in the dark to let more light in. When it is very bright your pupel gets smaller to block light.
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Which part of the eyes control size of the pupil?
the part of the eye that controls the pupil is the iris
What acts as a reflexively activated diaphragm to vary pupil size?
The Iris.
What is the circular opening of the eye which controls the amount of light that enters the eye?
The pupil. However, as it is a hole, i.e. an absence of anything it seems odd to say it controls anything. The iris controls the size of the pupil and therefore the amount of light entering.
Th color ring of muscle that controls the size of the pupil is called?
The iris.
How do the pupil and iris work together?
Retina- light image is focused on the retina, and it contains the photosensitive receptor cells Pupil- the opening of the eye. The size of the opening is regulated by the iris Iris- pigmented part of the eye (gives people their eye color). The iris is composed of smooth muscle and controlled by reflex.
Which part of the eyes control size of the pupil?
the part of the eye that controls the pupil is the iris
Is it possible for your pupil to grow bigger than your iris?
No. The pupil can only open to the size of the iris.
How does the iris control the size of the pupil?
the iris
Where is the iris located?
The iris is the layer that surrounds the pupil and controls the size and diameter of the pupil. It also controls the amount of light that reaches the pupil.
What are the rings of muscle around the pupil gives the eyes color?
it is known as Iris. contraction or relaxation of iris alters the size of pupil.
What is the opening that is controlled by the muscles of the iris?
The opening that is controlled by the muscles of the iris is called the pupil. The iris is responsible for adjusting the size of the pupil in response to different lighting conditions.
Colored part of the eye that contracts or relaxes in response to light?
The Iris contains the muscles that control Pupil size.
What contains muscle that controls the size of the pupil?
iris
What is the colored ring of muscle that controls the size of the pupil is called?
The Iris.
What acts as a reflexively activated diaphragm to vary pupil size?
The Iris.
The colored ring of muscles that controls the size of the pupil is called?
iris
What is the black hole in the center of the iris?
The black circle in the middle of the iris in your eye is called a pupil. It dilates to adjust with sunlight.
