|
|
|
|
|
|
|
|
|
|
|
|
|
Blind Spot Experiment :
The retina is the part
of the eye covered with
receptors that respond
to light. A small
portion of the retina
where the optic nerve
connects to the brain
has no receptors. An
image that falls on this
region will not be seen.
Close your right eye.
With your left eye, look
at the L below. Slowly
move your head closer or
further away from the
screen while looking at
the L. The R will
disappear when your head
is approximately 50 cm
(20 in) from the screen.
You can repeat the
experiment with your
right eye by looking at
the R. |
|
|
|
L
R |
|
|
|
|
|
|
|
|
|
|
|
Pinhole Experiment :
Take two pieces of heavy paper.
On one of them make three holes
with a pin spaced about 2 mm
apart (1/16 inch) from each
other. On the other one, make a
single hole with the pin. Place
the card with the three holes
next to your eye and look
through the holes at the card
with one hole. You will see
three holes instead of one.
|
|
| |
|
|
Top |
| |
|
Stereoscopic
Vision :
Stereoscopic vision makes depth
perception possible. By crossing your
eyes while looking at these two
pictures, the brain perceives a combined
image with a central section on a
different plane. (Hint: Keep your eyes
level with the pictures. Place your
fingertip between the pictures on the
line that says "BOA" and look at your
fingertip while you bring your finger
toward your eyes. When your fingertip is
approximately 7 inches (20 cm) from your
eyes, the pictures in the background
will combine into a 3-dimensional
picture.) |
| |
|
|
| |
|
|
Top |
| |
|
|
|
|
| |
|
|
Top |
| |
|
Color Vision Test
People with normal color vision can
perceive numbers formed by patterns of
colored dots in every circle. If you do
not see some of the numbers, you should
have your eyes checked and consider
working in a job where color
discrimination is not critical.
Approximately 6%-8% of people of
European descent, 4%-6% of people of
Asian descent, and 2%-4% of people of
African descent have some type of
defective color vision. |
|
|
|
|
|
|
Previous Illusitions|Top |
|
|
|
For Any further questions,
Please Click Here |
|
|
|
|
| Copyright©2006
Sahajanand Eye Care Hospital Pvt. Ltd..
|
| Best Viewed in 800 x 600 I.E. 4.x or Greater | Dev.
At :
Vibrant ITES
| |
|
|
|
