``There are many choices out there for eye care, what sets EMVC apart is that we know patients have the choice and we value that they have made the decision to come to EMVC.``
-Vanessa, Optician/Project Coordinator
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What is 20/20 vision?
``20/20 vision`` is commonly accepted as the standard of normal distance vision for a human being. Basically it means ``good visual acuity at 20 feet.`` So if your vision is 20/20, you can read certain sizes of letters on a Snellen chart clearly at 20 feet or closer. But if your friend has 20/15 vision, his visual acuity is better than yours: you would have to stand 15 feet away from the chart to read the smaller letters that he can read while standing 20 feet away. Conversely, someone with 20/30 vision has worse distance vision than you.
Accommodative Spasm
A spasm of accommodation (also known as “low accommodation,” or “accommodative spasm”) is a condition in which the ciliary muscle of the eye remains in a constant state of contraction. Normal accommodation allows the eye to ``accommodate`` for near-vision. For this reason, many people are assumed to have normal (20/20) vision, but actually have difficulty reading or focusing.
Myopia, or Nearsightedness
Myopia occurs when an eye is too long for the corneal curvature. As a result, light rays entering the eye do not come to a sharp focus on the retina at the back of the eye. Instead, they focus further forward, producing a blurred image. People who are highly myopic have an increased risk of a retinal detachment resulting from the ``pulling`` on the retina.
Hyperopia, or Farsightedness
Hyperopia occurs when an eye is too short for the corneal curvature. As a result, light rays entering the eye focus behind the retina instead of precisely on the retina, and a blurred image is produced. A person with hyperopia cannot see distant objects clearly.
Astigmatism is the result of having a cornea that is irregular in shape. The cornea is normally round. An astigmatic cornea is oblong or ``football`` shaped, resulting in a condition that generally causes eyestrain, headaches and blurry vision. Astigmatism is often associated with nearsightedness and farsightedness and is not considered a medical problem.
Presbyopia is a condition in which the focusing ability of a person's eyes has decreased to the point where vision at his reading distance becomes blurred and difficult. You may begin to notice early signs of Presbyopia around the age of 40.