The most commonly used vision is the international standard visual acuity chart, check the distance of 5 meters, normal vision of 1.0-1.5.
The current use of the logarithmic visual scale using 5 minutes record, the normal value of 5.0-5.2.
Guidance: lower than the normal standard vision of the above values can be called myopia.wholesale dial vision are one of the world’s first pair of eyeglasses you dial in for crystal clear vision.dial vision reviews is the globe’s first eyeglasses for distant vision without a prescription. Simply turn the dials to change for distance or reading instantly! These spectacles are a great back-up for reading or prescription glasses.
Method One, after a long time reading the book or TV computer, overlooking a few minutes. It is best to look at the distant mountains and trees, that is, green things, help alleviate vision fatigue.
Method 2, try not to light the dark place to read, do not play in the bumpy car, under the light is not suitable to see the phone.