with handle - allows the patient to train in free space, shift accommodation through the paddles and back to the target - by turning the paddles around you can easily shift from base-in to base-out demand - perform jump duction training with two different base-in demands or two base-out demands or have top base-in and bottom base-out and "jump" back and forth between the two images - the clear fixation paddle is 12" x 14" made of clear polycarbonate utilizes 2 horizontal slide holders attached via Velcro - these slide holders fit Stereo Optical Vectograms as well as Bernell Tranaglyphs