Crossed Eyes Test
condition 'crossed eyes' is perhaps better known by its medical
names 'squint' or 'strabismus'. It occurs when the eyes are
not coordinated. When one eye is looking at something, the
other eye is looking in a different direction, either turned
in towards the nose or looking out.
The Light Reflex Test
You can do this simple diagnostic test if you suspect a squint.
Get the person to look straight ahead into the distance and
shine a light from a penlight torch into the eyes at an arm's
length away. Observe the reflections of the light beam off
the corneas. If both light reflexes are seen at or close to
the center of the pupils, there is no squint. However, if
any one of the reflections is seen off the center of the pupil,
a squint is present.
Note : This test is not sensitive in picking up small angle squints.
If in doubt, a professional eye examination should be done.
The Four Dot Test
You will need to source for red and green cellophane papers.
For each colour, cut an 8cm diameter circular patch and tape
the red over the right and green over the left eye. Start
the test and look at the four illuminated dots on the screen
from a distance of 10 ft. If FOUR BRIGHT DOTS are seen, no
squint is present.
bright red dots are seen, the right eye is the fixating eye
and the left eye, the squinting eye. If three bright green
dots are seen, the left eye is the fixating eye and the right
eye is the squinting eye.
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