Vision Training Glasses - Black Glasses for tired eyes that help improve eyesight. Use them while reading, working on the computer, or playing games on your smartphone. You can care for your eyes while wearing pinhole glasses. The pinhole effect is the effect of making it easier to focus by narrowing the beam of light that enters the eye when looking at an object through a small hole. This utilizes the principle that people with poor eyesight can see better when they squint. Black sunglasses with perforated lenses Keeps your vision clear ___________________________________ Discounts available for bulk purchases, so please take a look at my other products too♡ ____________________________________ Eye strength training, vision, vision correction Mesh, black, Black