Defects of Vision 10th physics | nearsightedness | myopia | hypermetropia | correction of defects

Atif Ahmad Official

12.16 Defects of Vision nearsightedness farsightedness myopia hypermetropia Correction of defect
Queries solved in this video
1. What are Defects of Vision
2. What is nearsightedness
3. What is farsightedness
4. What is myopia
5. What is hypermetropia
6. How to correct Defects of Vision
7. Correction of myopia
8. Correction of metropia,
9. Correction of nearsightedness
10 Correction of farsightedness
11. Correction of lens defects
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12.16 DEFECTS OF VISION
The inability of the eye to see the image of objects clearly is
called defect of vision.
The defects of vision arise when the eye lens is unable to
accommodate effectively. The images formed are therefore
blurred.
Nearsightedness (myopia)
Some people cannot see distant objects clearly without the
aid of spectacles. This defect of vision is known as short sight
or nearsightedness and it may be due to the eyeball being too

long. Light rays from a distant object are focused in front of
the retina and a blurred image is produced (Fig.12.38-a).
Fig. 12.38: Correction of near sightedness
The nearsighted eye can be corrected with glass or contact
lenses that use diverging lenses. Light rays from the distant
objects are now diverged by this lens before entering the eye.
To the observer, these light rays appear to come from far
point and are therefore focused on the retina, thus forming a
sharp image (Fig.12.38-b).
Farsightedness (hypermetropia)
The disability of the eye to form distinct images of nearby
objects on its retina is known as farsightedness.
When a farsighted eye tries to focus on a book held closer
than the near point, it shortens its focal length as much as it
can. However, even at its shortest, the focal length is longer
than it should be. Therefore, the light rays from the book
would form a blurred image behind the retina (Fig.12
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