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.

It has been estimated that the complex system that enables eyesight requires about 30 percent of a person’s oxygen intake and 25 percent of their nutritional intake. Thus, healthy eyesight depends on essential nutrients, such as vitamins.

According to the University of Michigan Kellogg Eye Center, astigmatism usually occurs when the front of the eye -- the cornea -- is curved more in one direction than the other. The resulting distortion in one’s vision is much like looking in a wavy mirror.

Eye health is an important concern at any age, but especially for children. As kids’ eyes grow and develop, changes occur that can permanently affect their eyesight. Paying close attention to any changes in their vision is important to prevent sometimes severe injuries or conditions.

Exercise stresses the body -- stress is what causes the positive results -- but exercise should not cause frightening symptoms like dizziness or loss of vision. When you experience negative symptoms like these, it is your body's way of telling you that something is wrong.

Warm compresses are useful for temporarily relieving discomfort caused by dryness, irritation and redness in the eye area. Some causes of eye discomfort are bacterial infections, viral infections, sinusitis, conjunctivitis, dermatitis, rosecea, styes, blepharitis and allergies.

The clear tissue at the front of the eye is the cornea; in order to have clear vision, the tissue of the cornea needs to remain thin and transparent. The inner layer of the cornea called the endothelium keeps the cornea clear, and if there is a problem with the cells in this layer, corneal edema may result.

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.

Retinal detachment is a condition where the back of your retina separates from the underlying layers of the eyeball. This separation detaches the retinal tissue from the blood vessels, which then deprives the retina of blood, oxygen and other nutrients.

Eye drops allow direct delivery of medicine to the eyes without possible side effects that can occur with oral medications. Eye drops are the preferred form of medication delivery for a variety of eye ailments, but parents sometimes worry whether they are safe for kids.

Your child may have drainage from the eyes that causes matter to build up in the corners or along the eyelashes. She may have other symptoms as well such as discomfort, eye redness or eyelid swelling.

A bump in the corner of your eye could indicate a serious problem that might affect your vision. An optometrist or ophthalmologist should check any abnormalities that form near your eyes to prevent further complications.