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The iris controls the size of the pupil by means of contracting the iris sphincter muscle and/or the iris dilator muscle. The size of the pupils is dependent on many factors (including light, emotional state, cognitive load, arousal, stimulation), and can range from less than 2 mm in diameter, to as large as 9 mm in diameter.
In ancient Greek religion and mythology, Iris (/ ˈ aɪ r ɪ s /; EYE-riss; Ancient Greek: Ἶρις, romanized: Îris, lit. 'rainbow,' [2] [3] Ancient Greek:) is a daughter of the gods Thaumas and Electra, [4] the personification of the rainbow and messenger of the gods, a servant to the Olympians and especially Queen Hera.
Iris (from Greek Ἶρις Ancient Greek:, the messenger of the gods among themselves and the personification of ἶρις, the "rainbow") is a feminine name.. The name came into use in English-speaking countries in the 1500s, first in reference to the goddess, and was later used along with other Ancient Greek names revived by 17th-century British poets, such as Doris and Phyllis.
Iris most often refers to: Iris (anatomy), part of the eye; Iris (color), an ambiguous color term; Iris (mythology), a Greek goddess; Iris, a genus of flowering plants;
Immune reconstitution inflammatory syndrome (IRIS) is a condition seen in some cases of HIV/AIDS or immunosuppression, in which the immune system begins to recover, but then responds to a previously acquired opportunistic infection with an overwhelming inflammatory response that paradoxically makes the symptoms of infection worse.
Yellow Iris pseudacorus flowers on a blue field of water. The heraldist François Velde is known to have expressed the same opinion: [8] However, a hypothesis ventured in the 17th c. sounds very plausible to me. One species of wild iris, the Iris pseudacorus, yellow flag in English, is yellow and grows in marshes (cf. the azure field, for water ...
(The double meaning in Latin is preserved in English, where pupil means both "schoolchild" and "dark central portion of the eye within the iris".) [27] This may be because the reflection of one's image in the pupil is a minuscule version of one's self. [25]
Iris recognition biometric systems apply mathematical pattern-recognition techniques to images of the irises of an individual's eyes.. Iris recognition is an automated method of biometric identification that uses mathematical pattern-recognition techniques on video images of one or both of the irises of an individual's eyes, whose complex patterns are unique, stable, and can be seen from some ...