This document discusses various tests used to measure stereopsis, or binocular visual depth perception. It describes local and global stereopsis and lists several common stereopsis tests, including the Titmus Stereo Test, TNO Test, Lang Test, and Randot Stereotest. It provides details on specific tests, such as the plates and disparity levels measured in the TNO Test, disparity ranges for the Lang I and Lang II tests, and disparity levels tested in the Titmus and Randot stereotests.

1. Optom.Askar.PK
TESTS FOR STEREOPSIS
31ST DEC 2011

2. STEREOPSIS
Binocular visual depth perception
based on retinal rivalry.
It can be measured quantitatively in
seconds of arc.

3.  Local stereopsis - This is detected with
stereograms that have individual elements
such as lines, edges or contours, such as
the Wirt circles found in the Titmus
stereo test .
 Global stereopsis - This is detected
using random dot stereograms such as the
Lang I and II, and the TNO test.

4.  Two-Pencil Test
 Synaptophore or Major
Amblyoscope
 Stereogram
 Titmus Stereo Test
 Random-Dot Stereograms
 TNO Test
 Lang Test

5. Key points
 Good illumination is required.
Sufficient presentation time is
needed to allow appreciation of the
disparity.

6. LANG'S TWO-PENCIL TEST
Qualitative measurement..
 The test is performed with
both eyes open and then with
the 'weaker' eye covered.
 The responses are compared.

7. SYNAPTOPHORE
MAJOR AMBLYOSCOPE

8. STEREOPSIS SLIDES

10.  The object seen in depth, which has
the least disparity, denotes the
patient’s stereoscopic threshold.

11. TNO TEST
 Consists of seven plates: three gross
stereo plates, one suppression plate and
three graded plate
 Ranging from 480 to 15 seconds of arc.

12. PLATE I

13. PLATE II

14. PLATE III

15. PLATE IV

17. PLATE V
480
240

18. PLATE VI
120
60

19. PLATE VII
30
15

20. LANG STEREOTEST
 The targets are seen alternately by each eye, and
are then fused to create the disparity.
 The Lang I test - a cat, a star and a car –
 1200 to 550 seconds of arc.

21.  The Lang II test - a star ,a car, an elephant and a
moon
 200 seconds of arc.

22. FRISBY STEREOTEST
 Random triangular shapes
 Three plastic plates of different thickness: 6, 3
and 1 mm.
 Each plate has four squares of shapes

 600 to 15 seconds of arc.

24. TITMUS STEREOTEST
 3000 seconds of arc
 The second plate consists of nine sets of four
circles (Wirt circles).
 800 to 40 seconds of arc.

26. RANDOT STEREOTEST
 Six random dot shapes.
 500 to 250 seconds of arc.
 The second plate consists of circles, measuring
from 400 to 200seconds of arc and three rows of
animals with disparities from 400 to 100 seconds of
arc.

27. REFERENCE
 Practical Binocular Vision Assessment…
BUTTERWORTH,,HEINEMANN…..
 Binocular Vision and Ocular Motility
THEORY AND MANAGEMENTOF STRABISMUS
Gunter K. von Noorden, MD..Emilio C. Campos, MD…Mosby