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Do
this test if your Distance Vision Test result is worse than
6/6.
Instructions
You will first need to make a pinhole eye occluder. This can
be simply made by cutting out an 8cm by 12cm piece of card
paper and punching a 1.5 mm diameter pinhole through it as
shown
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PICTURE
OF PINHOLE OCCLUDER
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To do the Pin Hole Test, the Distance Vision Test is simply
repeated with the eye looking through the pinhole.
If you
wear glasses, do the test wearing your normal DISTANCE prescription
glasses.
INTERPRETING
THE RESULTS
This is a very useful test that supplements the distance vision
test. It is done when visual acuity is found to be sub-normal
i.e. 6/9 or worse. The test is helpful in differentiating
whether the sub-normal visual acuity is due to uncorrected
refractive errors or due to an eye disease.
If the
visual acuity improves looking through the pin hole by one
or more rows down the chart then it is likely that the sub-normal
vision is probably due to uncorrected refractive errors and
the visual acuity should be correctable to normal with corrective
lenses.
If the
sub-normal visual acuity is not improved at all looking through
the pinhole, it is likely that an eye disease is present so
an eye doctor should be consulted soon.
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