Original Stereo Fly Stereotest from Stereo Optical Company, Inc.

The Standard for Stereo Depth Perception. Test and evaluate both Gross (2500 to 1200 sec or arc) and Fine Depth Perception. The Test Includes:

• Graded Circle Test (800 to 40 sec of arc)
• Animal Test for Children (400 to 100 sec of arc)
• 1 Pair of Standard 3-D Viewers