Lens implant Health Dictionary

A spectacle lens in which the upper part is shaped to assist distant vision and the lower part is for close work such as reading.... bifocal lens

(1) The placing of a substance such as a drug, or an object such as a pacemaker, in a body tissue.

(2) The surgical replacement of injured or unhealthy tissue or organ with healthy tissue or organ (also known as TRANSPLANTATION).

(3) Attachment of the early EMBRYO to the lining of the UTERUS, which occurs around six days after conception; the site where this happens is where the placenta will develop.... implantation

An artificial structure surgically introduced into the breast to increase its size (see mammoplasty).... breast implant

A device used to treat profoundly deaf people who are not helped by hearing aids. A cochlear implant consists of tiny electrodes surgically implanted in the cochlea deep in the inner ear and a receiver that is embedded in the skull just behind and above the ear. A microphone, sound processor, and transmitter are worn externally. A cochlear implant does not restore normal hearing, but it enables patterns of sound to be detected. Combined with lip-reading, it may enable speech to be understood.... cochlear implant

Any material, either natural or artificial, inserted into the body for medical or cosmetic purposes. For example, artificial joints can replace diseased structures and breast implants can improve appearance. Implants are also used to maintain proper functioning of an internal organ, treat certain disorders, or deliver drugs or hormones.... implant

The internal optical component of the eye responsible for focusing; also called the crystalline lens. It is situated behind the iris and is suspended on delicate fibres from the ciliary body. The lens is elastic, transparent, and slightly less convex on the front surface than on the back. Changing its curvature alters

the focus so that near or distant objects can be seen sharply (see accommodation). Opacification of the lens is called cataract. (See also lens dislocation.)... lens

A cochlear implant is an electronic device, inserted under a general anaesthetic, which stimulates the auditory system, restoring partial hearing in profound sensory deafness. Although there are many types of cochlear implant, they all consist of a microphone, a signal processor, a signal coupler (transmitter and receiver), and an array of electrodes. Most are multi-channel implants. The microphone and signal processor are worn outside the body, like a conventional hearing aid: they receive sound and convert it into an electronic signal which is transmitted through the skin to the receiver. Here the signal is transmitted to the array of electrodes which stimulates the cochlear nerve. Although cochlear implants do not provide normal hearing, most profoundly deaf patients who receive a cochlear implant are able to detect a variety of sounds, including environmental sounds and speech. The duration of hearing-loss and age at implantation are among the many factors which in?uence the results (see DEAFNESS).... cochlear implants

Medic.

Family: Vitaceae.

Habitat: Forests of tropical and subtropical India, from Himalayas as far west as Kumaon, and southwards to the Peninsula.

Ayurvedic: Chhatri, Karkatajihvaa, Kukurjihvaa.

Siddha/Tamil: Nalava, Nyekki, Ottanali.

Folk: Karkani (Maharashtra).

Synonym: L. esculenta Moench.

Family: Papilionaceae; Fabaceae.

Habitat: Native to South West Asia; cultivated as a pulse crop mainly in North India, Madhya Pradesh and some parts of Maharashtra.

English: Lentil.

Ayurvedic: Masura, Masurikaa, Mangalyaa, Mangalyak, Adaasa.

Unani: Masoor.

Siddha: Misurpurpu.

Action: Seeds—mostly used as a pulse. Contain as much as 30% proteins (similar to those of peas and beans). Soup is used in gastric troubles and constipation. Paste or poultice is applied to foul and indolent ulcers.

Dosage: Dried seed—10-20 g. (API, Vol. III.) oil, extracted from the seeds, is similar to olive oil. The seeds possess feeble antimalarial activity. The seed extract showed 100% toxicity against Alternaria alternata and marked toxicity against Aspergillus niger.

Dosage: Root—5-10 g powder. (API, Vol. IV.)... lens culinaris

See EYE.... lens of the eye

Irritation, soreness, friction, inflammation. “People who use extended- wear soft contact lenses are more likely to develop serious microbial keratitis infection than users of other lenses.” (Research team, Moorfields Eye Hospital, London) Risk of keratitis was seen to increase when soft lenses were worn for more than six days.

Alternatives:– Douche. Simple teas: Fennel or German Chamomile; half a teaspoon dried herb or teabag to cup boiling water. Infuse 15 minutes. Half-fill eye-bath and use as douche, tepid. OR: quarter of a teaspoon distilled extract Witch Hazel in eye-bath; half-fill with water. Natural lubricant for contact lens is Evening Primrose oil (contents of a capsule). See: EYES, INFECTION.

Supplements. Daily. Vitamin A 7500iu, Vitamin B2 10mg, Vitamin C 400mg, Vitamin E 400iu, Beta carotene. Zinc 15mg. ... contact lens fatigue

A hormonal method of contraception in which longacting contraceptive drugs are inserted under the skin.

An implant consists of a small rod that steadily releases a progestogen drug into the bloodstream.... contraceptive implant

Attachment of a fertilized ovum (egg) to the wall of the uterus.

It occurs about 6 days after fertilization, when the blastocyst (early embryo) comes into contact with the wall of the uterus.

As the cells of the developing embryo continue to divide, the outer cell layer penetrates the lining of the uterus to obtain oxygen and nutrients from the mother’s blood; later, this layer develops into the placenta.

The embryo usually implants in the upper part of the uterus; if it implants low down near the cervix, placenta praevia may develop.

Rarely, implantation occurs outside the uterus, possibly in a fallopian tube, resulting in an ectopic pregnancy.... implantation, egg

A post, surgically embedded in the jaw for the attachment of a dental prosthesis (an artificial tooth). Titanium or synthetic materials may be used. A dental implant is fitted under local anaesthesia. A hole is drilled in the jaw and a post inserted. Several months later, an attachment that protrudes from the gum is screwed into the post; a few weeks after that, the prosthesis is fitted.... implant, dental

Displacement of the crystalline lens from its normal position in the eye. Lens dislocation is almost always caused by an injury that ruptures the fibres connecting the lens to the ciliary body. In Marfan’s syndrome, these fibres are particularly weak and lens dislocation is common.A dislocated lens may produce severe visual distortion or double vision, and sometimes causes a form of glaucoma if drainage of fluid from the front of the eye is affected. If glaucoma is severe, the lens may need to be removed. (See also aphakia.)... lens dislocation

A prosthesis inserted into the penis to help a man suffering from permanent impotence to achieve intercourse.

The various types include a silicone splint inserted in the tissues of the upper surface of the penis, and an inflatable prosthesis that is inflated by squeezing a small bulb in the scrotum.... penile implant

See implants, dental.... titanium dental implants

a device similar to a *cochlear implant except that the electrode stimulates the auditory parts of the *brainstem rather than the cochlea. It is used to restore hearing of profoundly deaf people who have had damage to both auditory nerves and are hence unsuitable for cochlear implantation. It consists of an electrode that is permanently implanted on the surface of the brainstem. An external device with a microphone and an electronic processing unit pass information to the electrode using radio-frequency waves. The implant is powered by batteries in the external part of the device. It is most commonly used in patients with *neurofibromatosis type II who have had bilateral *vestibular schwannomas.... auditory brainstem implant

a lens with fine parallel lines (almost invisible striations) across its width, used in various vision tests; for example, to test suppression and abnormal retinal correspondence. [B. Bagolini (20th century), Italian ophthalmologist]... bagolini lens

a soft contact lens that can be useful in managing certain external eye disorders, including tiny perforations.... bandage lens

see implant.... dental implant

(fetal graft) the introduction of an ovum, fertilized in vitro and developed to the *blastocyst stage, into the uterus of a postmenopausal woman in order that she may become pregnant. Before this procedure, the woman’s uterus must be prepared, by hormone therapy, to receive and nurture the blastocyst. Hormone treatment is continued throughout the pregnancy.... fetal implant

(ICD) a self-contained device, similar to a *pacemaker, that monitors heart rhythm and delivers an electric shock to correct life-threatening arrhythmia. See also defibrillator.... implantable cardiovertor defibrillator

a form of hearing aid in which a small electrical vibrator is surgically attached to the auditory *ossicles. An external device with a microphone and an electronic processing unit passes information to the implanted device using radio-frequency waves. The external part is located behind the pinna and is powered by batteries.... implantable hearing aid

(ILR) a device, inserted beneath the skin of the chest, to record the heart rhythm for up to two years. It is usually used for the investigation of patients presenting with infrequent syncope (fainting) in whom arrhythmia is the suspected cause. When syncope occurs, the device can be examined using wireless technology to reveal the heart rhythm at the time of the episode.... implantable loop recorder

a valved device used in the surgical treatment of some types of glaucoma to control intraocular pressure by allowing fluid to drain from the anterior chamber into the subconjunctival space.... molteno implant

(TAVI) replacement of the aortic valve in patients with *aortic stenosis using a catheter-delivered prosthesis rather than open heart surgery. Usually the catheter is passed via the femoral artery, but sometimes it can be passed via the subclavian artery or through the wall of the left ventricle via a localized *thoracotomy.... transcatheter aortic valve implantation