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प्रश्न
In what two ways is the yellow spot different from the blind spot?
उत्तर
Yellow spot is the region of brightest vision and contains maximum sensory cells whereas a blind spot contains no sensory cells and this is the point of no vision.
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संबंधित प्रश्न
Draw a labelled sketch of the human eye.
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
Are these lenses thinner at the middle or at the edges?
Name the part of the eye:
which changes the focal length of eye-lens.
What happens to the size of pupil of our eye (i) in dim light (ii) in bright light?
What is presbyopia? Write two causes of this defect. Name the type of lens which can be used to correct presbyopia.
When is a person said to have developed cataract in his eye? How is the vision of a person having cataract restored?
fill in the following blank with suitable word:
A person is short-sighted if his eyeball is too............Spectacles with a .............lens are needed. A person is long-sighted if his eyeball is too............Spectacles with a ................lens are needed. These focus light rays exactly on to the..........
Out of animals of prey and predators, which have their eyes:
on the opposite sides of their head?
Mention if the following statement is true (T) or false (F) Give reason.
Ciliary muscles regulate the size of the pupil
Name the following:
White part of the eye.
Define the following:
Yellow spot
Answer the following question.
Write the structure of eye lens and state the role of ciliary muscles in the human eye.
What is a Lachrymal gland?
Explain the structure and functioning of Human eye. How are we able to see nearby as well as distant objects?
Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?
Match the following:
| Column - I | Column - II |
| 1. Retina | a. Path way of light |
| 2. Pupil | b. Far point comes closer |
| 3. Ciliary muscles | c. near point moves away |
| 4. Myopia | d. Screen of the eye |
| 5. Hypermetropia | e. Power of accommodation |
Assertion (A): Rods and Cones are photoreceptors in the sclera of eyeball.
Reason (R): Rods are sensitive to dim light.
Write in proper sequence the names of all the parts of the human eye through which the light rays coming from an object pass before they form an image on the retina.
Name the following:
Place of best vision in the retina of the eye.
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.
