Advertisements
Advertisements
Question
Give Reason:
Older people require glasses to read and write.
Advertisements
Solution
In old age the flexibility of the lens declines and the lens becomes less convex or opaque leading to weakness of eyesight.
APPEARS IN
RELATED QUESTIONS
The kind of lens required to correct Myopia
What is the scientific name of
short-sightedness
A man can read the number of a distant but clearly but he finds difficulty in reading a book.
What type of spectacle lens should he use to correct the defect?
State one role of ciliary muscles in the human eye.
What is Hypermetropia (far sightedness)?
Given alongside is a diagram depicting a defect of the human eye. Study the same and then answer the questions that follow:
(i) Identify the defect.
(ii) Name the parts labelled 1, 2 and 3.
(iii) Give labelled two possible reasons for this eye defect.
(iv) Draw a labelled diagram to show how the above mentioned defect is rectified.
Have a look at the posture of this woman who is reading a book and answer the questions which follow:
What are the two conditions shown in sections A and B of the eye as applicable to her?
Differentiate between:
Short-sightedness and Long-sightedness.
Observe the following diagram and answer questions following it:
- Identify the defect of vision shown.
- List its two causes.
- Name the type of lens used for the correction of this defect.
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 |
