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प्रश्न
Distinguish between: blind spot and yellow spot
उत्तर
| Blind spot | Yellow spot |
| Blind spot is a spot on the retina present at the point of origin of the optic nerve. | Yellow spot is a small area on the retina present at the posterior pole of the eye, lateral to the blind spot. |
| Photoreceptor cells are absent from this region. | Only cones are present in this region. |
| They are insensitive to light as both rods and cones are absent. | They are sensitive to bright light as cones are present. |
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संबंधित प्रश्न
Explain why the image distance in the eye does not change when we change the distance of an object from the eye?
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
Which is the weaker eye?
Name the part of the eye:
which changes the focal length of eye-lens.
What is the name of:
the curved, transparent front surface of the eye?
Define the term "power of accommodation" of human eye.
List, in order, the parts of the eye through which light passes to reach the retina.
Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.
State whether the following statement is true or false:
Rabbit has eyes which look sideways.
Name the muscles of the eye responsible for the power of accommodation.
State the function of each of the following parts of the human eye:
(i) Cornea
(ii) Iris
(iii) Pupil
(iv) Retina
Millions of people of the developing countries are suffering from corneal blindness. This disease can be cured by replacing the defective cornea with the cornea of a donated eye. Your school has organised a campaign in the school and its neighbourhood in order to create awareness about this fact and motivate people to donate their eyes after death. How can you along with your classmates contribute in this noble cause? State the objectives of organising such campaigns in schools.
State the main functions of the following:
Seminal Vesicles
Name the following:
The focal length of the lens is altered by the contraction of which type of muscles.
Name the following:
The type of lens used for correcting myopia.
Choose the Odd One Out:
Write an Explanation.
Power of accommodation
What kind of lens is there in our eyes? Where does it form the image of an object?
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 |
With neat, labeled diagram describe the structure of retina of eye.
Name the following:
Place of best vision in the retina of the eye.
Differentiate between members of the following pair with reference to what is asked in the bracket.
Aqueous humour and vitreous humour (location).
