The document discusses the Titmus stereotest, which is used to test stereoacuity and depth perception. It consists of polarized vectograph images in the form of a booklet, viewed through polarized 3D glasses. The test contains images of a housefly, animals at varying disparities, and circle patterns where one circle floats in front or behind the others. It is performed at 40cm and tests the ability to perceive depth in images with disparities as small as 40 seconds of arc. One disadvantage is that it contains monocular cues that could provide clues instead of relying purely on stereopsis.

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2. VECTOGRAPH
A vectograph is a type of stereoscopic print or
transparency viewed by using the polarized
3D glasses most commonly associated with
projected 3D motion pictures
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3. introduction
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 An elementary vectograph is a polarizing filter
sheet that encodes a photographic image as areas
which polarize light more or less strongly,
corresponding to the darker and lighter areas of
the image.
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4.  When the sheet is viewed by itself in ordinary light,
a pale image is seen.
 When viewed through a uniformly polarizing filter
sheet oriented in the same plane of polarization,
the image is almost completely invisible. If either
sheet is then rotated 90 degrees about its axis, so
that their planes of polarization are at right angles
to each other, the image becomes boldly visible.
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5. The Titmus stereotest
 It is a contour stereotest . it is performed at a
distance of 40 cms
• The Titmus test consists of 3D Polaroid vectograph
consists of two plates in the form of booklet viewed
through Polaroid spectacles they are present right
angle to each other .
• they have pictures like fly , circles ,animals .
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6.  This test uses crossed Polaroid filters to present slightly
different aspects of the same object to each eye.
 The test comprises of three sections:
 The Housefly - which shows large disparities and should
be seen in depth by most subjects.
 Stereoacuity range of Random Dot butterfly is
- Bottom of lower wing : 1150 sec of arc
- Tip of abdomen : 700 sec of arc
- Top of upper wing : 2000 sec of arc
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 The subject is asked to pick one of the wing of the
fly .
 If px sees stereoscopically he will reach to avove
plates.

8.  Animals – there are 3 rows of animals, one animal
in each row having a crossed disparity which ranges
from 100, 200, 400 secs of arc.
 One disadvantage of this test is that it contains
monocular cues.
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10.  Circle Patterns – this section consists of 9 patterns
containing four circles.
 One of the circles in the pattern contains a graded
disparity (crossed), so that when it is viewed
binocularly it is seen to float in front of the others.
The disparities of the circles range from 800 to 40
secs of arc.
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 Limitation in amblyopia and heterotropia

12. Thank u
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