If you find yourself needing to hold books, magazines and other written material at arm's length to read the words, you are probably developing a condition known as presbyopia. Presbyopia is a common age-related change in vision that usually strikes around the age of 40.

Nearsightedness, or myopia is a common vision problem that affects about four out of every 10 people. People who are nearsighted have trouble seeing in the distance.

Improperly adjusted plastic eyeglasses can be uncomfortable and cause eyestrain. Most of the time, you can find a nearby optician who will adjust your eyeglass frames at no charge; however, you can also adjust plastic eyeglass frames yourself.

According to Refractive Error Source, it is common to have some degree of imperfect vision because light does not focus correctly on most people's retinas. Most vision issues can be corrected with eyeglasses.

Photochromic eyeglass lenses darken when you wear them outdoors, removing the need for sunglasses or clip-ons. Color-changing lenses are available from many companies, though the technology behind the most popular brands is owned by Transitions Optical, Inc., according to Gary Heiting, O.D.

Eyeglass lenses are typically made from glass, polycarbonate and plastic, with plastic being the most popular option. Not only are plastic lenses a cheaper alternative, but they are lightweight and impact-resistant. The downside is that plastic lenses are more likely to scratch, and those scratches can become annoying.