Health on MSN5mon
What's the Difference Between Being Nearsighted and Farsighted?
Nearsightedness (myopia ... concave lenses, which are thinner in the middle and thicker on the edges. These lenses help align ...
BBC4y
Common defects of the eye and how they can be overcome
Two common defects of the eyes are myopia (short-sightedness) and hyperopia (long-sightedness ... Short-sightedness can be corrected by placing a concave lens in front of the eye, as shown ...