Nearsightedness (also known as myopia) is a vision condition where near objects are usually seen clearly, but distant objects are blurred and do not come into proper focus. This affects nearly 30% of the American population. Typical symptoms are: squinting when trying to see distant objects, eyestrain, and sometimes headaches. It can be treated by prescribed eyeglasses or contact lenses. There are also a number of options that have been developed to surgically alter the shape of the cornea to reduce nearsightedness.
Farsightedness (also known as hyperopia) is a vision condition where distant objects are generally seen clearly, but close ones are not brought into proper focus. This condition is only a problem if it significantly affects a person's ability to see. Common signs of farsightedness are difficulty in concentrating and maintaining clear focus on near objects, blurred vision, eye strain, fatigue and/or headaches after close work. Farsightedness can be treated with prescribed eyeglasses or contact lenses.
Astigmatism happens when the front surface of your eyes (cornea) is slightly irregular in shape, resulting in vision being blurred at all distances. A majority of people have some degree of astigmatism however, only moderate to highly astigmatic eyes may need corrective lenses. Severe astigmatism can cause blurred or distorted vision, while mild astigmatism can cause headaches, eye strain, fatigue or blurred vision at certain distances. Almost all levels of astigmatism can be optically corrected with properly prescribed and fitted eyeglasses or contact lenses.
Presbyopia is an age-related condition that occurs when the lens inside the eye begins to harden and can no longer focus properly. This typically begins to develop in the mid-40s, though it eventually will happen to everyone. Since people with presbyopia cannot see nearby objects clearly, they tend to hold objects farther away to be able to focus better. No cure exists for presbyopia. However, there are several treatments available to correct your vision. Depending on your condition and lifestyle, you may be able to choose from corrective lenses, contact lenses, or surgery to correct your vision.