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Learn to plant and care for irises, the tall, beautiful flowers named after the Greek goddess of rainbows. Find out about different types, colors, and varieties of irises, and how to deal with pests and diseases.
The iris is the colored, muscular part of the eye that controls the size of the pupil and regulates the amount of light entering the eye. Learn about the structure, function, and disorders of the iris from Britannica, the online encyclopedia.
- The Editors of Encyclopaedia Britannica
The iris ( pl.: irides or irises) is a thin, annular structure in the eye in most mammals and birds, responsible for controlling the diameter and size of the pupil, and thus the amount of light reaching the retina. In optical terms, the pupil is the eye's aperture, while the iris is the diaphragm. Eye color is defined by the iris.
Iris is a flowering plant genus of 310 accepted species [1] with showy flowers. As well as being the scientific name, iris is also widely used as a common name for all Iris species, as well as some belonging to other closely related genera.
May 19, 2023 · Learn how to choose, plant, and care for iris, a diverse group of perennial flowers with colorful and intricate blossoms. Find out about different types, varieties, and tips for growing iris in your garden.
- Nadia Hassani
Feb 20, 2024 · Learn about the iris, the colored part of the eye that controls pupil size and regulates light entering the eye. Find out the common disorders that affect the iris and pupil, such as glaucoma, iritis, and heterochromia, and how to treat them.
Feb 20, 2022 · Learn about the iris, the colored part of your eye that controls your pupil and helps you see in different lighting. Find out what conditions can affect your iris and how to take care of it.
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