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A coloboma (from the Greek κολόβωμα, meaning "defect") [1] is a hole in one of the structures of the eye, such as the iris, retina, choroid, or optic disc.The hole is present from birth and can be caused when a gap called the choroid fissure, which is present during early stages of prenatal development, fails to close up completely before a child is born.
Unsurprisingly, a photographic lens with the ability to continuously vary the size of its aperture (the hole in the middle of the annular structure) is known as an iris diaphragm. An iris diaphragm can reduce the amount of light that hits a detector by decreasing the aperture, usually with "leaves" or "blades" that form a circle. [2]
Iris laevigata Fisch – Rabbitear Iris, Shallow-flowered Iris, kakitsubata (Japanese) Iris maackii Maxim. Iris pseudacorus L. – Yellow Iris, Yellow Flag; Iris versicolor L. – Larger Blue Flag, Harlequin Blueflag; Iris virginica L. – Virginia Iris; Series Longipetalae (Rocky Mountain or long-petaled iris) Iris longipetala Herb. – (Coast ...
It contains the best-known genus - Iris. The members of this subfamily are widely distributed worldwide. They grow in all continents except Antarctica. Iris milesii. They produce typical sword-shaped leaves and have mainly corms or rhizomes. There are some exceptions which have bulbs. These are two subgenera of Iris - Xiphium and Hermodactyloides.
Iris delavayi is a species of flowering plant in the subgenus Limniris and in the series ... It has grey-green leaves, long hollow stem, and 2 flowers in various blue ...
Iris lortetii (also known as Lortet's iris or in Israel as the Samarian iris) is a species in the genus Iris. It has straight grey-green leaves, a 30–50 cm tall stem, and large showy flowers in late spring or mid-summer that come in shades of pink, from white, lilac, pale lavender and grey-purple. It is veined and dotted pink or maroon.
Iris glaucescens is a plant species in the genus Iris and subgenus Iris.It is a rhizomatous perennial, found in Russia, Kazakhstan, Mongolia and China.It has blue-grey sickle-shaped leaves, slender stem, and spring flowers in blue-violet, pale violet, lilac-purple, to deep purple, to light bluish, and almost white shades.
Iris typhifolia is a species in the genus Iris, also the subgenus Limniris and in the series Sibiricae. It is a rhizomatous herbaceous perennial , from China. It has slender, twisted leaves, deep green slender hollow stem and 2 violet-blue flowers.