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प्रश्न
Differentiate between members of the following pair with reference to what is asked in bracket.
Myopia and hyperopia (cause of the defect)
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उत्तर
Myopia results when the eye ball is lengthened from front to back or the lens is too curved.
Hyperopia results from either too shortening of the eyeball from front to back or when the lens is too flat.
संबंधित प्रश्न
What is the scientific name of
long-sightedness?
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
A person can read a book clearly only if he holds it at an arm's length from him. Name the defect of vision:
- if the person is an old man
- if the person is a young man
A person cannot read newspaper placed nearer than 50 cm from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length.
State one role of ciliary muscles in the human eye.
List two causes of presbyopia. Draw labelled diagram of a lens used for the correction of this defect of vision.
In what two whys is a yellow spot different from the blind spot?
Give Reason:
Older people require glasses to read and write.
Differentiate between:
Myopia and Hypermetropia.
Differentiate the eye defects: Myopia and Hypermetropia
