write one important role of eye part iris and choroid.
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Protoplasm, the cytoplasm and nucleus of a cell. The term was first defined in 1835 as the ground substance of living material and, hence, responsible for all living processes. ... Today the term is used to mean simply the cytoplasm and
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•Behind the iris sits the lens. By changing its shape, the lens focuses light onto the retina. Through the action of small muscles (called the ciliary muscles), the lens becomes thicker to focus on nearby objects and thinner to focus on distant objects.
•Traditionally, the choroid has been assigned as its major functions, supply of oxygen and nutrients to the outer retina, light absorption (pigmented choroid), thermoregulation, and modulation of intraocular pressure.
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