Advertisements
Advertisements
प्रश्न
Explain the Term: Hypermetropia
Advertisements
उत्तर
With age, the elasticity of the lens decreases, and the individual becomes long-sighted and is called Hypermetropia In this condition, the diameter of the eyeball from front to back is too short. The clear image falls beyond the retina and the eye sees a blurred image. Hypermetropia may be corrected by the use of a biconvex lens.
संबंधित प्रश्न
Name the defect of vision in a person:
whose near point is more than 25 on away.
Name one defect of vision (or eye) which cannot be corrected by any type of spectacle lenses.
Name the body part with which the terms myopia and hypermetropia are connected.
Differentiate between members of the following pair with reference to what is asked in the bracket.
Rods and cones (sensitivity).
By closing the eyes and gently pressing them by your palms, you may see some specks of brilliant light. How do you get this sensation while there is no light entering your eyes?
Differentiate between:
Myopia and Hypermetropia.
The diagram given below represents the cross-section of the human eye:
(i) Name the parts labeled 1—12.
(ii) What is the function of the part marked ‘10’?
(iii) What would happen if part ‘5’ is damaged or cut?
Given below is a diagram showing a defect of vision. Name the defect of vision and draw an accurately labelled diagram to correct this defect.
What are the causes of ‘Myopia’?
State reasons for Myopia. With the help of ray diagrams, show the:
- image formation by a myopic eye, and
- correction of myopia using an appropriate lens.
