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प्रश्न
Explain the Term: Accommodation in the eye
उत्तर
Accomodation in the eye is the process of adjusting the eyes so that the image can be focused on the retina and seen clearly. This is done by altering the curvature of the lens by the contraction or relaxation of the ciliary muscles.
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संबंधित प्रश्न
Define the term.
Power of accommodation of the eye.
Compare the following: Choroid and retina
Answer briefly:
How do you perceive the colour of an object?
The size of the pupil becomes ______ when you see in dim light.
Match the following:
| Column I | Column II |
| (i) Myopia | (a) Converging power of eye lens becomes low |
| (ii) Hypermetropia | (b) Converging power of eye lens remains the same |
| (c) Converging power of eye lens becomes high |
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?
What kind of lens is present in the human eye?
How does the eye adjust to take account of an increase in brightness?
Where does the greatest degree of refraction of light occur in the eye?
Refraction of light in the eye occurs at:
(a) the lens only
(b) the cornea only
(c) both the cornea and the lens
(d) the pupil
The human eye possesses the power of accommodation. This is the power to:
(a) alter the diameter of the pupil as the intensity of light changes
(b) distinguish between lights of different colours
(c) focus on objects at different distances
(d) decide which of the two objects is closer.
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Cones : Iodopsim :: Rods : ______.
Sometimes you remember a vivid picture of a dream you saw. What is the role of your eyes in this experience?
Choose the correct answer.
In the chemistry of vision, the photosensitive substance is _________________
Name the capacity of the eye lens to change its focal length as per need.
The image formed on the retina of the human eye is ____________.
Match the following
| 1. | Conjunctiva | a. | Coloured part of eye |
| 2. | Cornea | b. | Photosensitive layer |
| 3. | Iris | c. | Refraction |
| 4. | Retina | d. | Protection |
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:
The circular opening enclosed by iris.
