The task involves drawing along the lines with a washable marker (black or navy blue) or a regular stick. The exercise can be performed with one eye covered or using red-green filters. The green filter should be placed on the weaker eye, and the red filter on the stronger eye.
The given price is for one board (variant).
The product is compatible with Bernell® red-green filters. It should be used according to the recommendations of a qualified vision therapy specialist. If used contrary to the recommendations, undesirable side effects may occur.