Features1Improve Eyesight: The cards can exercise binocular eyesight, can improve visual sense, suitable for people with strabismus and amblyopia. 2Strabismus Training: Visual sense training card can be used as a good tool for strabismus and amblyopia training, which is easy to use. 3Perfect Size: The size of a single strabismus training card is 14 x 7cm / 5.51 x 2.76in, light in weight, which is easy to hold without fatigue. 4Package Included: A total of 2 amblyopia correction cards, easy and simple to use, persistent training can effectively improve the visual function. 5Coated Paper: Strabismus improve cards are made of coated paper material, waterproof and resistant to dirty, which can be used for a long time.SpecificationItem Type: Strabismus Training Cards Material: Coated PaperSingle Sheet Size: Approx. 14 x 7cm / 5.51 x 2.76inHow To Use: 1. Hold the card close to your nose, with the smallest pattern close to you. The left eye is red side and the right eye is blue side.2. Look at the farthest large visual pattern on the card. At this time, the trainer feels that the large visual pattern is red and green mixed, while the medium visual pattern and the small visual pattern are red and green, and they are distributed on the left and right sides.3. Look at the large, medium and small patterns alternately, and hold the coalesce for 5 seconds. When the trainer focuses on one pattern, the other two patterns are red and green. Alternate gaze 10 times between different patterns.4. If the trainer feels fixation difficulty, he can try the following methods:Suggesting that the trainer's sensory pattern is getting closer to himself (convergence),Move the training card slightly further or lower. Package List2 x Cards