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प्रश्न
Differentiate between:
Retina and Choroid.
उत्तर
| Retina | Choroid |
| (i) It is the innermost layer of the eye-ball. | It is the middle layer of eye ball tunics. |
| (ii) It contains neurons. | It contains blood capillaries. |
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संबंधित प्रश्न
Write the function of retina in human eye.
Name two parts of the eye which refract light rays (or bend light rays).
What is the function of the lens in the human eye?
What do the ciliary muscles do when you are focusing on a nearby object?
Name the part of our eyes which helps us to focus near and distant objects in quick succession.
Define the term "power of accommodation" of human eye.
Fill in the following blank with suitable word:
To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made..........
How is the amount of light entering the eye controlled?
How does the eye adjust itself to deal with light of varying intensity?
The human eye forms the image of an object at its ______.
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..........
A student sitting on the last bench in the class cannot read the writing on the blackboard clearly but he can read the book lying on his desk clearly. Which of the following statement is correct about the student?
(a) The near point of his eyes has receded away.
(b) The near point of his eyes has come close to him.
(c) The far point of his eyes has receded away.
(d) The far point of his eyes has come closer to him.
Five persons A, B, C, D and E have diabetes, leukaemia, asthma, meningitis and hepatitis, respectively.
Which of these persons can donate eyes?
Draw a diagram of the human eye as seen in a vertical section and label the parts which suit the following descriptions relating to the:
(i) photosensitive layer of the eye.
(ii) structure which is responsible for holding the eye lens in its position.
(iii) structure which maintains the shape of the eyeball and the area of no vision.
(iv) anterior chamber seen in front of the eye lens.
(v) outermost transparent layer seen in front of the eyeball.
For the normal human eye, the near point is at ___________ cm.
A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in Figure . In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?
 |
 |
 |
 |
| (i) | (ii) | (iii) | (iv) |
In the figure of the human eye, the cornea is represented by the letter
The coloured portion of the eye is the ______.
What is ‘white of the eye’?
State the functions of the following:
Ciliary muscles
