The Sheridan Gardiner Test is a test of
Visual Acuity designed to meet the needs of children too young to be able
to take a Snellen
Chart Test.
(Young children may not be able to take a Snellen Chart Test if they
are not sufficiently familiar with the letters of the alphabet to be able
to reliably identify them correctly - however well they can see and distinguish
them.)
A Sheridan Gardiner Test consists of a set of cards,
each marked with a single letter of specific size - there being a range
of sizes of letters in the set. Cards are shown one-at-a-time to the child
who is located a specific distance away (usually 6 metres in Europe).
Unlike the Snellen Test, in which the patient/subject is expected to simply
identify the letter verbally, the child is provided with an identification
card showing a set of letters including the one shown to him/her on the
card (6 metres away). The child is asked to identify the single letter
on the card by pointing to the same letter on the identification card
in front of him/her - hence he/she does not need to know and be able to
say the names of the letters of the alphabet.
The Sheridan Gardiner Test is generally deemed suitable
for children aged 2 to 7 years.
This section includes short definitions of clinical and surgical procedures
concerning the eyes and human visual system. For definitions of other
terms in this category, choose from the list to the left.
Other related pages include the diagram
of the eye, and definitions
of parts of the eye, a description
of the human retina, and the section about disorders
of the eye and visual system.
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