If a magnifying glass will magnify the sun’s rays, then wouldn’t wearing prescription glasses actually be dangerous for our eyes?

Question

If so, does prescription glasses that come with photochromatic or polarised lenses help to combat this?

In: Biology

Answer 1

Sun rays are dangerous when they are focused into a point. Lenses of your glasses can do it, but that point is well behind your eyes. At the distance you are using them, it is only intensifying the sun rays by a little.

Unless you are myopic, that is, in which case they actually spread the sunlight into lesser intensity.

Take the glasses off and shine light through them onto the ground. You can see the effect as a region of intensified or shaded light.