1.2 vision is a relatively normal vision, the refractive power should be between 50 degrees of myopia and 100 degrees of hyperopia, usually a degree of refractive vision is good, usually around 1.2. If there is significant farsightedness, astigmatism, myopia, it will affect the visual acuity. Usually more than 300 degrees of farsightedness, about 100 degrees of myopia, about 100 degrees of astigmatism will lead to vision loss, so if there is a decline in vision, you need to timely optometry and glasses to be able to improve vision, other drugs, food is no way to make vision to improve.