Feature: 1. Modern eye care tools, can be used to exercise eyes anytime, anywhere. 2. Can mobilize the potential of the eyes, improve reading speed. 3. Improve visual clarity, make the eyes more comfortable. 4. Professional eye care tools to give you a satisfying experience. 5. Come with 6pcs visual card, meeting your different demands. Specification: Condition: 100% Brand New Item Type: Optical Flipper Material: Plastic + Paper Optional Degrees: ±150 Degree, ±200 Degree Optical flipper is used to change the regulatory stimulus, the positive mirror reduces the regulatory stimulus, the negative mirror increases the regulatory stimulus, and the collective stimulus remains unchanged. Therefore, the change of the regulatory set is accompanied by a change in the fusional image dispersion with the same amplitude but opposite direction. Function: improve the sensitivity and increase the range of adjustment (double-sided mirror with ± 2.00d) 1. Place the visual card at a distance of 40cm, usually 20/30 or 20/40 or 20/50. 2. Prepare a double-sided mirror of ± 2.00d (use ± 1.50d if you can't see clearly). 3. Prepare the Rock Card (single letter Card) in the visual Card and gradually exercise to a 3-letter Card, 4-letter Card and 5-letter Card. 4. Put + 2.00d in front of your eyes and quickly flip the double-sided mirror of ± 2.00D. It is required to see clearly the letters on the visual card. 5. Read each letter out loudly in the order of 1-40 on the letter card, and repeatedly flip the double-sided mirror of ± 2.00d. It is best to flip the mirror as quickly as possible, and keep the font of the reading object clear. 6. Exercise one eye and both eyes for 10-15 minutes once or twice a day. 7. Exercise until the response time is no less than 1 cycle /3 seconds, which is 20 cycles per minute, and the difference between the eyes is less than 2 cycles. 8. Generally, 15 days is a training course, and the symptoms can be improved.. Package List: 1 x Optical Flipper 6 x Visual Card