Bandage Lens: From 1 Different Sources
a soft contact lens that can be useful in managing certain external eye disorders, including tiny perforations.
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
A strip or tube of fabric used to keep dressings in position, to apply pressure, to control bleeding, or to support a sprain or strain. Roller bandages are the most widely used. Tubular gauze bandages require a special applicator and are used mainly for areas that are awkward to bandage, such as a finger. Triangular bandages are used to make slings. (See also wounds.)... bandage
A plastic prosthesis used to replace the removed opaque lens in cataract surgery.... lens implant
A firmly-applied, broad, elastic bandage applied to a limb to prevent the spread of venom injected after certain bites or stings. The pressure is enough to compress veins and lymphatic vessels, but not to cut off arterial supply and so it can remain on indefinitely. The bandage is first applied directlyover the envenomated area, and then extended over the entire limb which is then immobilised in a splint.... compression/immobilisation bandage
A rubber bandage which is applied to a limb before surgery from below upwards, in order to drive blood from the limb. The bandage is removed after an in?ated pneumatic TOURNIQUET has been placed round the limb; the operation can then proceed.... esmarch’s bandage
See EYE.... lens of the eye
A broad, rubber bandage wrapped around the elevated limb of a patient to force blood out of the blood vessels towards the heart; this creates a blood-free area, enabling surgery to be performed more easily.... esmarch’s bandage
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
lenses that are specially designed to give clear images, eliminating the coloured fringes that are produced with ordinary lenses (caused by splitting of the light into different wavelengths and hence its component colours). Such lenses are useful in scientific instruments, such as the eyepieces of microscopes.... achromatic lenses
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
n. a surgical procedure in which the crystalline lens of the eye is removed.... lensectomy
n. an instrument used to measure the refractive properties of an artificial lens, such as a spectacle lens.... lensmeter
a bandage consisting of padding and/or crepe and material containing elastic fibres that can stretch to up 300% of their original length. It is used in the treatment of venous leg ulcers and may be applied dry or as a cohesive layer. The fibres provide constant pressure and should not be worn overnight or during extended periods of rest.... long-stretch bandage
lenses containing more than one segment made to different prescriptions for visual correction. See bifocal lens; trifocal lenses.... multifocal lenses
see varifocal lenses.... progressive lenses
a bandage that exerts low resting pressure. It is inelastic but can stretch by up to 60% of its original length and is used in the treatment of *lymphoedema and venous leg ulcers.... short-stretch bandage
a bandage wound round a part of the body, overlapping the previous section at each turn.... spiral bandage
a bandage arranged to support a hanging part of the body. Examples include a sling used to hold an injured lower jaw in position and a bandage used to support the scrotum in various conditions of the male genital organs.... suspensory bandage
a piece of material cut or folded into a triangular shape and used for making an arm sling or holding dressings in position.... triangular bandage
lenses in which there are three segments. The upper provides a clear image of distant objects; the lower is used for reading and close work; and the middle one for the intermediate distance. Musicians sometimes find the middle segment useful for reading the score during performance.... trifocal lenses
(progressive lenses) lenses in which the power (see dioptre) gradually changes from one prescription to the other and there is no dividing line on the lens between the different segments (compare multifocal lenses). The wearer can see clearly at any distance by raising or lowering the eyes.... varifocal lenses
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