Consumers need reliable information about the number and type of friendly bacteria in food. Products such as yogurt that contain probiotics, or friendly bacteria, promote health by relieving lactose intolerance, enhancing the immune function or...
The human eye is often compared with a camera. Both share similar functions, according to Kellogg Eye Center at the University of Michigan. Although many of the parts of the eye and camera are comparable, certain aspects of the mechanisms of each...
Optic neuropathy, or optic neuritis, is damage of the bundle of nerves in the eye that can be caused by inflammation, increased optical pressure, or insufficient blood supply. Symptoms may vary based upon the cause of the disease. A proper survey...
Graves' disease is the most prevalent form of hyperthyroidism in the United States, reports the National Institutes of Health. All forms of hyperthyroidism share common symptoms, including nervousness, irritability, tremors, weight loss, weakness...
Your ophthalmologist or examining doctor may test your hearing, reflexes, visual acuity and other skills to determine whether or not you may have a brain tumor. Visual acuity tests can help determine the size and depth of the tumor by indirect...
A cataract occurs when the lens of the eye becomes cloudy, usually due to the effects of aging. The lens is a clear disk behind the colored iris. The lens plays a part in clear vision by focusing images on the light-sensitive retina at the back of...
The retina is a transparent lining of tissue along the back wall of the inner eye. The function of the retina is to receive an image from the cornea and send it through the optic nerve to the brain for processing. The retina can separate from the...
The cerebrum, which is the largest part of the brain, is divided into two hemispheres--the left hemisphere and right hemisphere. Each hemisphere has all four lobes of the brain--frontal lobe, parietal lobe, temporal lobe and occipital lobe--but...
The back wall of the eye is sensitive to light and is called the retina. It is a layer of tissue that sends signals via the optic nerve to the brain. The brain converts these signals to an image of what the eye is seeing. When retinal detachment...
According to the Mayo Clinic, your optometrist may use a specific vision test called a perimetry that will check the range of you peripheral vision. During a perimetry test, you will look into a bowl-shaped surface at a central point. Lights will...
The eye is a sensory organ that detects light and is one of the most complex of structures within the human body. The eye functions similar to that of a camera. Just as light passes through a lens, which is then focused at the back of the camera,...
Certain vitamins are essential for vision or may have protective effects against age-related deterioration of the eyes, and you can prioritize eating certain foods and obtaining the right nutrients in your diet to improve the health of your eyes....
Most people will initially visualize an eye as the organ that allows a living being to see. The human eye, however, is a complex organ comprised of many parts that work together to control vision. Healthy eyes will serve you well until you die,...
The body requires some amount of cholesterol in the blood in order to function properly, but excess cholesterol creates a plaque buildup in your blood vessels that over time this can lead to narrowing or complete closure of the vessel, explains...
Your optic nerves relay signals between your eyes and your brain. Specialized cells within your retinas, called rods and cones, detect light and color in the images you see, and send a neural signal relaying that visual information. Your optic...
Glaucoma is a leading cause of vision loss and blindness. The damage to the optic nerve that carries images to the brain generally occurs due to a build-up of pressure in the eye. The National Eye Institute recommends regular eye exams by an...
Throat disease might include anything from a simple sore throat to GERD (Gastroesophogeal Reflux Disease) to throat cancer. When throat symptoms occur in tandem with simple colds, the condition is rarely confusing and does not require a...
Glaucoma results when the pressure inside of the eye damages the optic nerve. The damage does not cause pain or offer early warning signs in the common forms of glaucoma. Doctors may notice signs on an eye exam, but, for most patients, by the time...
High blood pressure not only increases the risk of a heart attack or stroke, it can also cause damage to blood vessels anywhere in the body, including the eyes. High blood pressure can exist without ever causing any symptoms, until a heart attack...
Celestron Regal LX 8x42 binoculars are ideal for use by birders and wilderness lovers. According to Celestron, the Regal LX are part of the company's top-of-the-line premium series of binoculars and offer high-quality performance at a reasonable...
The lens sits behind the colored portion of the eye, or iris. It focuses light to the retina, which transmits images to the optic nerve. Sometimes the eye's transparent lens clouds, resulting in a cataract and visual problems. Symptoms of...
Your eyes work in the dark in the same way they work in the light: light enters your eye through the pupil, creating an image that gets inverted by the lens onto your retina, which then travels through your optical nerve into your brain. The...
Diagnosing disease is mostly a process of knowing what is "normal" and recognizing what is not. A doctor recognizes a disease by seeing a pattern formed by symptoms and findings during a physical examination. Laboratory tests can confirm these...
Knee replacement is for people who suffer from especially degenerative joint diseases such as arthritis. Patients with articular fracture, cruciate ligament tear or knee dislocation may also be candidates for joint replacement. During the surgery,...
Eyelashes typically grow outward, away from the globe of the eye. When lashes grow inward instead, the result is a painful condition called ingrown eyelashes, or trichiasis. The person may notice ingrown eyelashes scattered across one of his...
You are able to see images because light from the environment bounces off the object you are looking at. The light is reflected off of the object you are looking at and is then processed by the eye.
The retina is a thin, light-sensitive membrane covering the back of the eyeball and further attached to the optic nerve. As we perceive images, the retina converts these images into electrical impulses and sends them to the brain via the optic...
