Tranaglyphs (the red and green targets) utilize the red/green glasses to present similar but slightly different images to each eye. The lenses have the effect of cancelling the target of the same color. Each eye is presented with a separate image. The brain should then fuse the two separete images into one three-dimensional image. In general you should keep the target in  reading distance (eg: 40 cm), while you practicing. The goal of the exercise is to hold the fused image as long as possible and to regain a fused image as soon as possible. Work for 5-10 minutes per session.  
 
Tranaglyph Set includes:
2 Tranaglyph Charts
One Pair of Red/Green Glasses 
Instructions.