Advertisements
Advertisements
Question
Explain the Term: Hypermetropia
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
Name the defect of vision in a person:
whose far point is less than infinity
What is the other name of old age hypermetropia?
Name one defect of vision (or eye) which cannot be corrected by any type of spectacle lenses.
Explain with the help of labelled ray diagram, the defect of vision called myopia and how it is corrected by a lens.
When do we consider a student sitting in the class to be myopic? List two causes of this defect. Explain using a ray diagram how this defect of eye can be corrected.
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.
Choose the correct answer :
Presbyopia is a disease of _____________
Anuja cannot see the blackboard writing but she can see nearby things.
(a) What is the eye defect she is suffering from?
(b) State the possible reason for her defect.
(c) How is it corrected
Myopia and hypermetropia can be corrected by:
A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.
