The pupil is the large black circle that is in the center of each eye. It widens and narrows naturally in response to changes in the light. Pupils become larger in dim light to let in more of the image and smaller in bright light to limit the...
During an eye examination, the doctor looks through the pupils to physically inspect the anterior chamber of the eyes. By use of dilating drops, he can temporarily paralyze the muscles that control the iris, roughly doubling the size of the...
The pupil is the round black center of the eye. It is the opening that lets light into the eyeball. The colored iris surrounds the pupil. According to Ted M. Montgomery, O.D., the eye's pupil widens when the dilator muscles of the iris...
The pupil, the black spot in the center of the eye, is essentially a hole that allows light into the eye. The pupil enlarges and constricts as the muscles attached to it respond to stimuli such as light, which shrinks pupils. Darkness and stress...
During a full eye exam, most eye doctors need to dilate a patient's pupils. This allows him a clear view to see into the back of the eye. The doctor's assistant will put a drop in each eye, and the patient will wait a few minutes before the drops...
The iris is the colored muscle, called the sphincter muscle, of the eye that expands and contracts the pupil to control the amount of light entering the eye. In an eye that functions properly, the pupil will appear larger in low light and look...
Cymbalta is a prescription medication containing duloxetine hydrochloride. It is approved by the U.S Food and Drug Administration to treat major depression, fibromyalgia, generalized anxiety disorder and pain associated with diabetes. Cymbalta is...
Apraclonidine hydrochloride which is sold as Lopidine ophthalmic solution is an eye drop used to lower eye pressure. According to the Lopidine package insert, the exact mechanism by which Lopidine lowers eye pressure is not fully known at this...
Rifle scopes, or telescopic sights, are a highly accurate sighting instrument for aiming rifles. Several interdependent components, which function as a unit, make up the scope. Scopes are built from metal tubes and utilize glass lenses. A sighting...
Pseudoexfoliative glaucoma is a condition in which deposits of protein build up in the eyes. This can make it difficult for a liquid known as the aqueous humor to drain from the eyes, ultimately leading to increased eye pressure and nerve damage....
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....
Valerian is a slender, flowering herb grown in temperate areas, particularly in Europe and North America. Ancient Roman physicians recommended valerian for congestion and water retention, according to Michael Castleman, author of "The Healing...
Methadone is a long-acting opiate pain reliever that can also be used to help recovering opiate addicts by providing relief from withdrawal symptoms, according to PubMed Health. Methadone itself can be addictive, causing patients to experience...
Eye inflammation results from conditions that irritate the tissues in certain parts of the eye. For many people, inflammation will result in eye redness and discomfort. A person with severe symptoms may need to contact an eye doctor to determine...
According to RxList, diphenhydramine HCl, a first-generation antihistamine drug used to treat allergies, is an anticholinergic agent that causes extreme drowsiness. Diphenhydramine is the active ingredient in all Benadryl products, as well as in...
Duragesic is the brand name in the United States of the generic drug fentanyl in the form of a transdermal patch. This means the medication is absorbed into the body from an adhesive patch placed on the skin. Fentanyl is a narcotic analgesic or...
There are consequences that come from forcing your body to work in the prolonged state of emergency a stressful lifestyle produces. Long-term stress can result in overworked adrenals that are too compromised to perform their function. It's...
The pupil is the tiny dark hole in the center of the iris that dilates or constricts in response to the amount of light available and emotional states such as fear. The iris’s two muscles control the pupil’s size. Disorders that...
Each year millions of people suffer a head injury. Most of these injuries are not significant due to the bony structure of the head. Because the skull protects the delicate brain, most head injuries tend to be cuts and bruises. According to the...
Discovering and treating eye complications associated with diabetes can prevent more severe conditions from occurring, including blindness. Left untreated, cataracts, glaucoma and retinopathy may be diagnosed. Eye disorders are often caused by...
A fever is a symptom of a viral or bacterial infection. It is the body's natural way of fighting off illness. Although most fevers do not require the attention of a doctor, be sure to consult one if a child's fever lasts for more than 72 hours....
According to the research publication "Traumatic Brain Injury: Hope Through Research", acquired head injuries (also referred to as traumatic brain injury, or T.B.I) occur more frequently among children under the age of five, males between the ages...
Hostility is a form of aggression. Aggression is categorized as predatory or affective; in the predatory form, aggression is used by predators to capture prey. In animals, affective aggression is marked by vocalization, hair standing on end and...
Psilocybin is a psychoactive substance found in some fungi around the world. Along with psilocin, another psychoactive chemical, this illegal substance contributes to consciousness alteration for a few hours. While not addictive, psilocybin can...
Certain surgeries, such as cuts to extract cataracts, can greatly increase the likelihood of developing anisocoria in the future. Similarly, sports injuries, such as head traumas endured in hard contact sports (e.g. football and rugby), can...
Heat in the summer and cold temperatures in the winter affect blood pressure--the measure of the pressure of blood against the walls of the arteries--in a number of ways. Understanding the impact of temperature on blood pressure is vital to...
Hydrocodone is used for cough suppression and pain-relief, explains "The Encyclopedia of Addictive Drugs." It is an opioid drug with highly sedative effects and is estimated to be two to eight times more potent than codeine. The text "Neurobiology...
Many herbal remedies are found not to be effective for the ailments they are supposed to treat. However, there are some top medicinal herbs that are highly rated for their effectiveness. While allergy and potential side effects exist in herbal...
Sugar levels in the blood, or blood sugar, are regulated in the body by insulin. Learn about blood sugar, including treatments and safe levels, in this health video.
