If a personĀ can read letters at 20 feet that are readable at that distance to all people with normal vision, that person's visual acuity, or "eyesight", is said to be 20/20. If, on the other hand, a person is barely able to read letters at 20 feet that are readable at 40 feet to all people with normal vision.
Astigmatism
Astigmatism is a condition characterized by "blemishid vision"; that is, instead of light rays striking the retina in sharp focus, they spread out over a more or less diffuse area. Astigmatism is caused by the unequal curvature of either the cornea or the lens, sometimes both. Because the cornea and lens, are never optically perfect, most of us experience some degree of astigmatism. To correct astigmatism, the ophthalmologist prescribes glasses that compensate for the faulty curvatures of the refracting surfabes
HealthyCase - Giving Informations About Health
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By dr rend-san
14 Jul 2010
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Visual Acuity and Optical Defects |
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By HC Team
21 Jul 2010
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High Deductible Health Insurance Plus SupplementsEvery one of us has formed an opinion about health insurance that it is very expensive. For individual health insurance, one might have to spend hundreds of dollars while for family it may cost thousands. This is a tensed issue for private individuals as well as for businesses. We all are waiting for some reforms to get accepted but many of us are now losing our patience. |
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By HC Team
23 Jul 2010
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Evening Primrose Oil 1000mg: Helps You to Stay Healthy
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By dr rend-san
02 Aug 2010
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The Ear, the organ of sound and balanceThe ear is divided into the outer, middle, and inner parts. The outer ear consists of the auricle and the auditory canal. The middle ear, a small chamber lying within the temporal bone and separated from the outer ear by the eardrum (tympanic membrane), houses the ossicles (three tiny bones bearing the names malleus, incus, and stapes) and communicates with the upper throat via the eustachian tube. |
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By dr rend-san
05 Aug 2010
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Neurons And NervesThe human body contains a dozen billion nerve cells (neurons) interwoven into what we call the brain and spinal cord. The basic unit of the nervous system is theĀ neuron, which consists of a cell body and branched extensions, or processes. Dendrites are those processes conducting nerve (electrical) impulses to the cell body, and axons are those processes conducting nerve impulses away from it. Sensory neurons conduct nerve impulses to or toward the central nervous system; motor neurons conduct nerve impulses to the muscles, glands, and organs; and connector neurons conduct impulses from sensory to motor neurons. |
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Health is obviously one of the most important factors in many human lives because it may influence every single aspect especially in their daily activity. Thus, to keep the body healthy will absolutely need concern. So, before your health problems get into more serious condition, it is suggested for you to prevent the illnesses by supporting your body with particular product like Evening Primrose Oil 1000mg.