Advertisements
Advertisements
Question
Name an old age eye defect. Why is it caused?
Advertisements
Solution 1
Presbyopia is an age-old eye defect. In this condition, the lens loses flexibility resulting in far-sightedness.
Cataract is also very common in old people, the cornea becomes opaque and the vision is cut down even to blindness.
Solution 2
Hypermetropia. It is caused due to flattening of the eye lens (Also presbyopia in which lens looses flexibility).
APPEARS IN
RELATED QUESTIONS
What is the scientific name of
long-sightedness?
Name any two defects of vision which can be corrected by using spectacles.
A man can read the number of a distant bus clearly but he finds difficulty in reading a book.
- From which defect of the eye is he suffering?
- What type of spectacle lens should he use to correct the defect?
The defect of vision in which the eye-lens of a person gets progressively cloudy resulting in blurred vision is called:
(a) myopia
(b) presbyopia
(c) colourblindness
(d) cataract
Describe the mechanism of focusing the image of a distant object in your eye when you raise your head after reading a book.
Differentiate between:
Short-sightedness and Long-sightedness.
Write scientific reason.
Nearsightedness, this defect can be corrected by using spectacles with concave lens.
Observe the figure whether it is correct or not and explain the phenomenon.
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.
A teacher drew the diagram of the heart on the blackboard and told the students to copy it in their notebooks. Mahesh couldn't see the diagram clearly as it appeared blurred to him.
- Name the defect of the eye Mahesh is suffering from.
- Where is the image formed in this defect?
- Mahesh consults an eye doctor and is prescribed suitable lenses to correct the defect. Which type of lens do his spectacles have?
