Page 176 - Science Class 08

As gma c cornea
Far Sightedness
This disorder is called hypermetropia also. It Focal Point
occurs if the light-rays from distant objects
reach the re na before they meet. As a result,
near vision is blurred.

Convex glasses or contact lenses can set this
disorder right by making the light-rays meet at As gma c corner distorts the focal point of light
in front of and/or behind the re na.
the re na.
Care of the Eyes
Eyes are a wonderful organ of the body. They
are needed ll the life’s end. So, they must be
cared for properly and protected from any and
every possible harm or injury.

Some necessary steps to be taken in this
direc on are listed below:
Hypermetropia v Splash your eyes at least thrice a day with

clean and cold water — preferably water
cooled a er boiling.
v Never work in too dim or too bright light.
It’s be er to use a table-lamp with a shade.

v Never fix your eyes on something for too
long. Blink them from me to me to
relieve them of the strain that builds up by
Correc on : Convex Lens
constant gazing.
As gma sm v Never read in a moving bus, car or train.

This disorder occurs if all the light-rays coming Never read a book while lying down in bed.
from an object do not converge at one point It is harmful to the eyes.
inside the eye. It leads to total blurred vision— v Never rub your eyes if something gets into
distant vision as well as near vision. them. Let the tears come out and flow it
This disorder is corrected using a special type out along with them. If tear don’t work,
of glasses or contact lenses of cylindrical shape. splash the eyes with clean cold water.

v Save your eyes from any and every type of
Cornea injury. Be careful of sharp projec ons like
Focal Point
hooks, twigs, wall-fi ngs, etc. Also be
careful while doing physical ac vi es like
Light
walking, running, cycling, etc.

v In case of any injury or problem, lose no
Lens Re na me to see an eye-speciallist. Avoid self-
Normal treatment as it may prove dangerous.

176 Science-8