Fusion Test:
Purpose:
To measure binocular vision. Fusion is the ultimate phase in binocular vision. As for
phorias, fusion requires good visual acuity in each eye. In the case of phoria anomaly,
fusion can be obtained by stimulating the oculomotor muscles, which will correct the
phorias. Failure of this test signifies anatomical impossibility of convergence, which is
found in extreme cases of strabismus.
A fusion problem (which can range from fixation disparity to suppression of one of the
two images) can be an important source of visual fatigue during screen work. Normally,
in a successful test, the patient should see 4 dots.
Definition:
A group of white dots is presented to the patient with different patterns for each eye.
Awaited responses:
· Perception of 4 dots reveals fusion: the brain correctly superimposes the two
images coming from each eye;
· Perception of 2 dots reveals suppression: the brain neutralizes the image coming
from the right eye;
· Perception of 3 dots reveals suppression: the brain neutralizes the image coming
from the left eye;
· Perception of 5 points reveals diplopia: the brain is unable to correctly
superimpose the two images coming from each eye.
Including Purdue Job Standards Pre-settings
Fusion Test:
Depisteo VT1 "Occupational health Edition"
