Amblyopia generally develops in young children, before age six. Its symptoms often are noted by parents, caregivers or health-care professionals. If a child squints or completely closes one eye to see, he or she may have amblyopia. Other signs include overall poor visual acuity, eyestrain and headaches.
Archive for June, 2008
A misalignment of the eyes (strabismus) is the most common cause of functional amblyopia. The two eyes are looking in two different directions at the same time. The brain is sent two different images and this causes confusion. Images from the misaligned or “crossed” eye are turned off to avoid double vision. In Anisometropia there is a difference of refractive states between the two eyes. Cataract cause the image to be blurrier than the other eye. The brain “prefers” the clearer image. The eye with the cataract may become amblyopic. Ptosis is the drooping of the upper eyelid. If light cannot enter the eye because of the drooping lid, the eye is essentially not being used. This can lead to amblyopia. Nutritional deficiencies or chemical toxicity may result in amblyopia. Alcohol, tobacco, or a deficiency in the B vitamins may result in toxic amblyopia. Amblyopia can run in families.
There is no specific treatment for dengue. Persons with dengue fever should rest and drink plenty of fluids. They should be kept away from mosquitoes for the protection of others. Dengue hemorrhagic fever is treated by replacing lost fluids. Some patients need transfusions to control bleeding. Initial treatment of fever includes antipyretics (e.g., acetaminophen, NSAIDs). Infection should be treated with appropriate antimicrobial therapy and tailored as antibiotic sensitivities are identified. Many cases of deep-seated infection or abscess require percutaneous or surgical drainage. Fever due to malignancy will usually regress with surgical debulking, chemotherapy, and/or radiation directed at the primary tumor. Rheumatologic disorders may require NSAIDs, steroids, methotrexate, hydroxychloroquine, or other cytotoxic agents.Dantrolene for malignant hypothermia.
Dengue hemorrhagic fever is characterized by a fever that lasts from 2 to 7 days, with general signs and symptoms that could occur with many other illnesses (e.g., nausea, vomiting, abdominal pain, and headache). This stage is followed by hemorrhagic manifestations, tendency to bruise easily or other types of skin haemorrhages, bleeding nose or gums, and possibly internal bleeding. The smallest blood vessels (capillaries) become excessively permeable (“leaky”), allowing the fluid component to escape from the blood vessels. This may lead to failure of the circulatory system and shock, followed by death, if circulatory failure is not corrected.The principal symptoms of dengue are high fever, severe headache, backache, joint pains, nausea and vomiting, eye pain, and rash. Generally, younger children have a milder illness than older children and adults.
Infection with one virus does not protect a person against infection with another. A person can be infected by at least two, if not all four types of the dengue virus at different times during a life span, but only once by the same type. People contract dengue fever from the bite of an infected Aedes mosquito. Mosquitoes become infected when they bite infected humans, and later transmit infection to others.If not treated properly, dengue hemorrhagic fever may occur. Dengue hemorrhagic fever is severe and often fatal.Dengue fever can be caused by any one of four types of dengue virus:
Dengue Fever is an infectious disease which is characterized by severe pains in the eyes, head, and extremities. It is transmitted by the bite of a mosquito. It is transmitted to humans by the Aedes aegypti mosquito, which feeds during the day. Dengue fever and dengue hemorrhagic fever are acute febrile diseases, found in the tropics and Africa, and caused by four closely related virus serotypes of the genus Flavivirus.
Amblyopia is also known as lazy eye. It is a disorder of the visual system that is characterized by poor or indistinct vision in an eye. The problem is caused by either no transmission or poor transmission of the visual image to the brain for a sustained period of dysfunction or during early childhood. It is otherwise physically normal, out of proportion to associated structural abnormalities. It has been estimated to affect 1–5% of the population.Detecting the condition in early childhood increases the chance of successful treatment. Amblyopia normally only affects one eye.”Lazy eye” is frequently used to refer to amblyopia because there is no “laziness” of either the eye or the amblyope involved in the condition.