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The middle layer consists of the choroid, ciliary body and iris. The choroid is a dark pigmented thin vascular layer; thickening of the choroid in anterior forms ciliary body. Towards the front, choroid becomes doughnut-shaped iris which is the coloured part of the eye. The iris regulates the size of the pupil.
What is the function of the iris in human eye ? Iris restricts the light to pass through the eye over to the retina. Iris allows colour detection in eye. Iris provides protection to the eye from microorganisms. Iris controls the size of the pupil and hence the amount of light entering the eye.
The iris controls the amount of light entering the eyes. The Iris automatically adjusts the size of the pupil according to the intensity of light received by the eye. If the amount of light received by the eye is larger, then the iris contracts the pupil and reduces the amount of light entering the eye.
c. Iris of the eye d. Lining of the kidney tubule e. Muscles of the heart f. Bronchi of lungs . Open in App.
What are the functions of the cornea, iris, pupil, eye lens and retina?
The choroid is continuous with the iris; together the choroid and iris are called the uvea. The posterior surface of the iris is covered by the retina. The inner layer of the retina, i.e., the layer facing the posterior chamber, is called the posterior epithelium of the iris.
The iris is the area of the eye that contains the pigment which gives the eye its colour.
Light enters our eye through the cornea, the clear, curved layer in front of the iris and pupil. After passing through the cornea, light travels through the pupil which is surrounded by iris and behind the iris sits the lens which changes the shape and focuses light onto the retina then the photoreceptors in the retina convert the image into electrical signals, which are carried to the brain by the optic nerve.
(a) Draw a labelled diagram of the human eye. Label the following parts on this diagram: Cornea, Iris, Pupil, Ciliary muscles, Eye-lens, Retina, Optic nerve and Blind spot. (b) What are the functions of the following parts of the eye? (i) Iris (ii) Eye-lens (iii) Ciliary muscles (iv) Retina (v) Optic nerve
The cornea is the transparent front part of the eye that covers the iris, pupil and other parts of the eye.
