WHAT IS A SYNOPTOPHORE??
• It is an instrument which
compensates for the angle of
squint and allows the stimuli
to be presented to both eyes
• It is an ophthalmic instrument
which is used for diagnosing
the imbalance of the eye
muscle and treating them by
WHAT IS IT USED FOR??
• It is used to investigate the potential for
binocular function in the presence of a manifest
• Specifically used in children (from 3 years of
• Also used to detect suppression and Abnormal
HOW DOES IT WORK??
• Consists of two cylindrical tubes with a mirrored
right angled bend
• A +6.50 D lens in each eyepiece which optically sets
the testing distance to about 6 metres.
• Pictures are inserted in a slide carrier situated at the
outer end of each tube.
• Two tubes are supported on columns which enable
the pictures to be moved in relation to each other.
• It can measure horizontal, vertical and torsional
ESTIMATION OF GRADES OF
• Grade 1- (SIMULTANEOUS PERCEPTION)
tested by two dissimilar but not mutually antagonistic
pictures, such as a bird and a cage
• Grade 2- (FUSION)
Ability of the two eyes to produce a composite picture
from two similar pictures, each of which is
incomplete in one small different detail.
• Grade 3- (stereopsis)
Ability to obtain an impression of depth by the
superimposition of two pictures of the same object
which have been taken from slightly different angles.
• Done by determining the subjective and
objective angles of squint.
• In normal retinal correspondance, these two
angles are equal.
• In ARC, objective angle is greater than the
subjective angle and the difference between the
two is called ANGLE OF ANOMALY.