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प्रश्न
Explain clearly why, a person who has lost the sight of one eye is at a disadvantage compared with the normal person who has two good eyes.
उत्तर
A person who has lost sight in one eye is at a disadvantage for the following reasons.
(i) The person's field of view decreases. Having two eyes enables a person to see a larger area around him or her. With only one eye, the field of view becomes limited to only about 150o.
(ii) The person's ability to accurately judge the distances of objects decreases. In the case of a person with two good eyes, both the eyes would focus on the same object at different angles and send two images to the brain that slightly differ from each other. The brain then combines the two images to form a three-dimensional image of the object, which helps the person to judge the distance of the object accurately. With one eye, it becomes difficult to judge the distance accurately.
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संबंधित प्रश्न
State whether the following statement is true or false:
The image formed on our retina is upside-down
Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside?
What are rods and cones in the retina of an eye? Why is our night vision relatively poor compared to the night vision of an owl?
Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.
Explain the functions of the following parts of the eye:
(i) cornea
(ii) iris
(iii) pupil
(iv) ciliary muscles
(v) eye-lens
How much is our field of view:
with one eye open?
How much is our field of view:
with both eyes open?
Assertion: Blind spot is a small area of the retina which is insensitive to light where the optic nerve leaves the eye.
Reason: There are no rods or cones present at the junction of the optic nerve and retina in the eye.
At noon the sun appears white as
With reference to human eye answer the question that follow:
Name the part of the eye associated with the regulation of the shape of lens.
