Please be advised that viewing these test cards on a computer
monitor may produce discrepancies and therefore should not
be classed as a valid, they are purely designed to show
the tests available.
For exact measurements please call the Zeidan Centre for
an appointment.
Originally conceived by Dr Shinobu Ishihara these cards
where designed to be carried out in a room adequately lit
by daylight. The computerised version may produce some discrepancies
as the images have been optimised for web usage. The results
are not to be considered a valid medical test for colour
blindness and merely serve to illustrate.
Position yourself about 75cm from your monitor so that the
colour test image you are looking at is at eye level, you
should be able to see numbers or patterns, a description of
each test is also shown on each page
