Special Thanx to Mrs Haseela Hassan(2010-14 Batch) Alsalama College Of Optometry,Perinthalmanna)

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