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The pupil is the central opening of the iris on the inside of the eye, which normally appears black. The grey/blue or brown area surrounding the pupil
The pupil is the central opening of the iris on the inside of the eye, which normally appears black. The grey/blue or brown area surrounding the pupil is the iris. The white outer area of the eye is the sclera. The central outermost transparent colorless part of the eye (through which we can see the iris and pupil) is the cornea.
The pupil diameter can vary greatly due to various factors (primarily the pupillary light reflex), from constriction to as small as 2 mm, to dilation
The pupil diameter can vary greatly due to various factors (primarily the pupillary light reflex), from constriction to as small as 2 mm, to dilation larger than 8 mm in some individuals, though the maximal dilation also varies substantially by individual and decreases with age
Pupil dilated naturally to 9 mm due to dim light. The subject is an extreme case, as most individuals are not able to naturally dilate their pupils to
Pupil dilated naturally to 9 mm due to dim light. The subject is an extreme case, as most individuals are not able to naturally dilate their pupils to that extent
Pupil constriction can be in response to negative emotional states
Pupil constriction can be in response to negative emotional states
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Compound eye of an Antarctic krill
Compound eye of an Antarctic krill
Eye of a European bison
Eye of a European bison
Human eye, a refractive cornea type eye.
Human eye, a refractive cornea type eye.
The eyes of a mantis shrimp (here Odontodactylus scyllarus) are considered the most complex in the whole animal kingdom.
The eyes of a mantis shrimp (here Odontodactylus scyllarus) are considered the most complex in the whole animal kingdom.