Name the eye defect caused due to the following cause mentioned: Cause Eye defect Uneven curvature of cornea

Astigmatism is a defect in which some parts of the object are seen in focus while others are blurred and the image formed on the retina is not clear. In this disease the curvature of the cornea becomes irregular. It can be corrected by using cylindrical glasses.

Name the eye defect caused due to the following cause mentioned: Cause Eye defect Lens turns opaque

This eye defect is caused due to the membrane growth over eye lens, the eye lens becomes hazy or even opaque that leads to a decrease or loss of vision. This problem is called a cataract. It can be treated by surgically removing the lens and using spectacles with highly convex lenses, or it can be corrected by implanting a small plastic lens behind or in front of the iris.

Given below are sets of five terms each. Rewrite the terms in correct order in a logical sequence beginning with the first word that is underlined: Conjunctiva , Yellow spot, Pupil, Vitreous Humour, Aqueous Humour.

The eye has three main layers. They are the sclerotic layer or sclera, choroid layer and retina. The outermost thick, tough, fibrous, non-elastic and white coloured layer is the sclera. The sclera bulges and forms the cornea. The end of the sclera connects to the optic nerve. The second layer is the choroid layer. This layer is black and contains a lot of blood vessels. It encloses the eye except for the part of the pupil. The part is formed by the choroid layer around the pupil is the iris. Conjunctiva is a jelly-like layer which covering the inner white parts of the eye. Radial and circular muscles are present in the iris. The biconvex lens is present ultimately behind the pupil, attached to the ciliary muscles and suspensory ligaments. The lens divides the inner space of the eyeball into an aqueous chamber and a vitreous chamber. The area of no vision, called the yellow spot is present in the retina. C o n j u n c t i v a → A q u e o u s H u m o u r → P u p i l → V i t r e o u s H u m o u r → Y e l l o w s p o t

Correct and rewrite the statements by changing the biological term that is underlined in the statement: The part of the eye which can be donated from a clinically dead person is the Retina .

The cornea acts as the outermost lens of the eye. It helps our eyes to focus light, to see clear image. For example a patient who has an ocular tumour in the back of the eye may be able to donate the eye at the time the eye is removed. If a person is blind, the blind eye is removed, and can place the healthy cornea. The part of the eye which can be donated from a clinically dead person is the cornea .

State two functions of tears.

Tears are a clear liquid secreted by the lacrimal glands that are tear glands. The two functions of tears are as follows: It lubricates and smoothens the surface of our eyes so that light is refracted which enable us to see objects clearly. They protect your eyes from infections and irritating things, like dirt and dust.

State two functions of ear.

The human ear is a sensitive organ of the human body. The external ear (pinna) is the external structure of the human ear. It is elastic cartilage covered by a layer of skin. Hearing and balance are two important functions of the human ear. The tiny hair cells are found in the inner ear. The hair cells translate the sound waves into impulses that are transmitted to the brain by sensory receptors.

Give biological explanations for the following: We should not put sharp objects into our ears

The eardrum is very delicate, sharp objects may rupture them leading to deafness. Do not use Q-tips, bobby pins or sharp pointed objects to clean your ears. These objects may injure the ear canal or eardrum. Earwax is the ear's mechanism for self-cleaning.

Mention the exact location of the following Incus.

The incus is the middle of three small bones in the middle ear. It is located between malleus and stapes. It transmits vibrations from the malleus to the stapes. Another name of the incus is called the anvil.