Optical Flipper Adjustable Optometry Plastic Flip 6pcs With Visual Card Opt

Feature: \n 1. Modern eye care tools, can be used to exercise eyes anytime, anywhere.\n2. Can mobilize the potential of the eyes, improve reading speed.\n3. Improve visual clarity, make the eyes more comfortable.\n4. Professional eye care tools to give you a satisfying experience.\n5. Come with 6pcs visual card, meeting your different demands. \n\nSpecification: \nCondition: 100% Brand New \nItem Type: Optical Flipper \nMaterial: Plastic + Paper \nOptional Degrees: \u00B1150 Degree, \u00B1200 Degree \nOptical 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.\nFunction: improve the sensitivity and increase the range of adjustment\n(double-sided mirror with \u00B1 2.00d)\n1. Place th: