Eye exercises help relax and strengthen your eye muscles and may help you maintain flexibility in the muscle that bends your lens to focus at different distances. Eye exercises can't prevent the effects of aging, disease or some medications, but...
A variety of genetic disorders can affect lung structure and function. The severity of these disorders depends on the degree to which lung function is impaired. Hereditary lung diseases such as alpha-1 antitrypsin deficiency, cystic fibrosis,...
The human eye is a marvel of anatomy, providing us with the ability to see the world in all its textures, colors, and sizes. While dividing the eye into multiple layers can be done in a variety of ways, one way to think of layers of the eye is to...
The lens of the eye plays an important role in vision by focusing incoming light on the retina, the part of the eye responsible for processing images into nerve signals and sending them to the brain through the optic nerve. While the lens is clear...
All of the muscles of the eye are active in any eye movement. Muscles control right-to-left and up-and-down movement. Extrensic (extraorbital) muscles include the levator palpebrae superioris, medial and lateral rectus, superior and inferior...
The eyes are complex organs that allow for light and color perception. Each eye contains a number of tissues including nerve tissue that transmits visual information for processing within the brain, muscle and connective tissue that support eye...
The human eye provides us with the ability to visualize the world around us. Light enters the eye through the cornea and excites special neurons on the retina. The brain receives this information and interprets it so that we are aware of what we...
Involuntary muscles are either nonstriated or striated. They are found in the walls of hollow organs, in your eyes and around your hair follicles. Cardiac or heart muscle cells appear striated under a microscope because of the large number of...
Obesity affects 13 to 32 percent of the population, according to a 2007 report in "Epidemiologic Reviews." Thus, many people remain at risk for long-term consequences such as heart attack and stroke. Surgical treatments for obesity can be...
Topamax is a sulfa based medication used to prevent seizures and to treat migraine headaches. Topamax can cause severe eye symptoms in pediatric and adult patients. According to an article in "Review of Optometry," patients may suffer an allergic...
Eyes that remained fixed in one spot would severely limit your ability to take in the world around you. Fortunately, nerves transmit signals from the brain to the muscles attached to the eye to make them move up, down and sideways. Nerves also...
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,...
Dilating drops allow doctors a better view into the eye, make it easier to perform eye surgery, and relieve the pain of some eye diseases, like uveitis, an inflammation of the uvea in the eye. Drops used to dilate eyes are called mydriatics....
The human eye is a spherical organ that processes the images in front of us. The eye is simultaneously delicate and sturdy, composed of many different parts and points that work together to enable your vision. Remember to treat your eyes with care...
The motor, sensory and visual components of the eye are managed by 5 of the 12 cranial nerves. Damage to any one of these nerves can cause symptoms to manifest according to the specific function of that particular nerve. The nerves that are...
Eye pressure, the normal tension in the eye, is regulated by the aqueous fluid produced by the ciliary body. Normal eye pressure is 10 to 21 millimeters of mercury, or mmHg. The pressure in the eye rises if the amount of aqueous fluid increases,...
The eye is a sense organ that reacts to light and processes the emitted or reflected light from the objects around us. That allows us to see the shapes, colors, depth and dimensions of these objects. The eyes are connected with the brain, which...
The respiratory epithelium is the lining of the airway, extending from the nasal cavity through the branching respiratory tree to the terminal air sacs of the lungs. Together, the respiratory epithelium serves as a leak-proof barrier that...
Carbachol is a cholinergic drug, which means it causes parasympathetic effects in the eye. The autonomic nervous system, which controls reflex actions in the body, consists of the sympathetic and parasympathetic nervous systems .Carbachol is...
Blood vessels in the eye provide oxygen and nutrients to the cells. When the eyes become red, it is commonly due to tiny blood vessels beneath the eyes bursting. Diseases such as diabetic retinopathy and macular degeneration cause the...
The toxic effects of ultra violet radiation, or UVR, can injure the ocular tissues of the eye, including the cornea, lens and macula lutea, which is a minute yellowish area located near the center of the retina that constitutes the region of...
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 cornea, the dome shaped clear covering of the front part of the eye, is the first line of defense against injury to the eye. As such, it frequently suffers scratches and injuries from dust and other airborne materials, contact lenses, tree...
With steadily rising levels of environmental pollutants permeating the air, it is no surprise that, according to the Center for Disease Control, sinusitis currently affects 30.6 million American citizens---and that number is growing daily. Since...
As of 2009, according to the Centers for Disease Control and Prevention, ankylosing spondylitis is one of the top three types of arthritic diseases in the U.S., even though it has not received much attention. They estimate that as many as 15...
The skull is a bony structure with paired air-filled spaces called sinuses that function as an air filtration system. Sinuses have a mucus-producing lining and cilia, or hairy projections, that sweep germs and pollutants out. Inflammation of...
Uveitis is an eye condition that results when you have inflammation in the tissues of the uvea. This condition typically results in significant pain, irritation and light sensitivity. You may also experience blurry vision. If left untreated,...
The head is complex, but functional. Like the rest of the body, the head consists of skin, bone, blood vessels and nerves. However, the head also contains most sensory organs, such as the nose, eyes, ears and mouth. These structures, along with...
A systemic disease is a disease that involves the entire body or many of the organs of the body. An ocular manifestation of a systemic disease is how that disease affects the eyes. Indeed, many times an eye exam can result in the diagnosis that...
Intraocular melanoma is a form of eye cancer that can be very deadly. Get expert tips and advice on preventing and treating eye cancer in this video.
