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Farsightedness
Farsightedness Hyperopia occurs when the eyeball is too short from front to back, or the eye's focusing mechanism is too weak, causing light rays to be focused behind, rather than on the retina. People with hyperopia have difficulty seeing objects close up.
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Hyperopia
Hyperopia (or more rarely, hypermetropia), also known as farsightedness or longsightedness, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short), causing inability to focus on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves towards the eye, the eye must increase its power to keep the image on the retina.
Mechanism
The arrangement or association of the elements or parts of anything in relation to the effect they generate; the combination of mental processes by which an effect is generated.
Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.
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Fallopian tubes
Female reproductive organ. The fallopian tubes take up the mature ovum after ovulation and carry it to the uterus. The fallopian tubes are the site of fertilization.
Free radical
Any molecule that contains an unpaired electron. Free radicals are unstable and will extract electrons from other biological molecules, which generates more free radicals.
Fetus
The stage of human development from 10 weeks' gestation until birth.
Fertilization
The combining of the genetic material carried by sperm and egg to create an embryo. Normally occurs inside the fallopian tube (in vivo) but may also occur in a petri dish (in vitro).
Fibromyalgia
Fibromyalgia is a debilitating chronic syndrome (constellation of signs and symptoms) characterized by diffuse pain, fatigue, and a wide range of other symptoms. It is not contagious, and recent studies suggest that people with fibromyalgia may be genetically predispose. It affects more women than men, with a ratio globally of 3-5:1. Fibromyalgia is seen in 3-10% of the general population, and is mostly found between the ages 20 and 50.
Farsightedness
Fanconi anemia
A rare inherited type of aplastic anemia that is often but not always associated with skeletal abnormalities. Fanconi anemia carries an increased risk to the patient of developing acute myelogenous leukemia. The disorder may be treated by stem cell transplantation.
Forensics
Forensics or forensic science is the application of science to questions which are of interest to the legal system. For example, forensic pathology is the study of the human body to determine cause and manner of death. Criminalistics is the application of various sciences to answer questions relating to examination and comparison of biological evidence, trace evidence, impression evidence, drugs and firearms. Forensic odontology is the study of the uniqueness of dentition. Etcetera.
Fibula
Smaller of the two bones in the lower leg; runs from the knee to the ankle along the outside of the lower leg.
Foot
The distal portion of the leg, upon which an individual stands and walks. It consists, in man, of the tarsus, metatarsus, and phalanges and the tissues encompassing them.
Fibrositis
Inflammation of fibrous connective tissues in muscles. It often affects the muscles of the trunk and back. It may be a symptom of another disease, such as Sciatica, but in most cases the cause is unknown. Pain and stiffness.
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