This product is great for working on concentration, fine focus and peripheral vision. It includes one pair of pinhole glasses, one black eye patch, 23 peripheral worksheets and instructions. 
 
Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera, each perforation allows only a very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the retina and increases depth of field.