Light sensitivity
How are we able to sense light even with the eyes closed?
PHOTO: MAHESH HARILAL
ABHILASH
Thiruvananthapuram
We can make out light even though our eyes are closed
as the eye lids are thin structures which allow bright light
to pass through. We are all familiar with the fact that light
from a bright torch when kept against our fingers passes
through them giving a red colour. This red colour is due to
the blood flowing through the capillaries in our fingers.
The same phenomenon will be noticed when one puts a
small bright torch light into one's mouth. The light will be
seen shining through the cheeks.
When bright light can pass through the tissue of our
fingers and the cheek it definitely can pass through the
closed lids ( provided it is bright enough).
DR. ARULMOZHI VARMAN
Uma Eye Clinic, Chennai
Printer friendly
page
Send this article to Friends by
E-Mail
Sci Tech
