Eyeglasses correct many different types of sight problems, including nearsightedness, farsightedness or astigmatism (散光). Trying to understand those different numbers on an eyeglass prescription (验光单) requires understanding the measure
Trying to understand those different numbers on an eyeglass prescription (验光单) requires understanding the measurements optometrists (验光师) use when fitting you for corrective lenses (镜片). Diopters (屈光度)The numbers on your prescription are given in diopters, whose short form is "D". It ...