Question

Explain the following terms used in relation to defects in vision and also provide corrections for them: (i) Myopia
(ii) Bifocal lenses
(iii) Far-sightedness.
(b) Why is the normal eye unable to focus on an object placed within 10cm from the eye?

Answer 1

i) myopia - it means near objects are visible clearly but far objects seem to be blurred .
ii)bifocal lenses - these are used by people suffering from presbyopia ( mainly concerned with old age people )
iii) far sighted ness or hypermetropia - it is a defect of eye in which far objects are seen clearly but near objects seem to be blurred .
b) this is because the nearest point of eye for a distinct vision is 25 cm

Answer 2

1. myopia is a defect of eye in which a person can not see far objects clearly but can see closer image clearly. this defect is also called near sightedness.......

2. these are the lens which contains both concave and convex lens. and it is prescribed for defect presbiopia...

3. far -sightednees is also called hypermetropia. in this a person can not see near objects clearly but can see far objects...

4.because our eyes nearest point is 25 cm...

hope this help you :)