| VCPI | Virtual Control Program Interface |
|---|---|
| VE | vaginal examination; Venezuelan encephalitis; venous emptying; venous extension; ventilation; ventil... |
| VEUD | virtual emergency and urgency department |
| VFID | virtual focus-isocenter-distance |
| VH | vaginal hysterectomy; venous hematocrit; ventricular hypertrophy; veterans hospital; viral hepatitis... |
| VE | Virtual Endoscopy |
|---|---|
| VE | Virtual Environment |
| VR | Virtual Reality |
| VRML | Virtual Reality Modeling Language |
| ACT | Assertive Community Treatment |
| virtual focus | The point from which divergent rays seem to proceed, or that at which they would meet if prolonged backward. (05 Mar 2000) |
|---|---|
| virtual image | <microscopy> Such as seen in a mirror or through a magnifier. A virtual image has no real existence in space as does a real image from a lens. It does have a definite location, however, caused by the angles of divergence of the rays received by the eye. This can be shown by the common school experiment of placing a pin coincident with its mirror image behind a sheet of glass acting as a partial mirror. Its location can also be placed in design by extrapolating backwards to a focus. If a magnifier is used as it should be, with the object at its focus, the virtual image is at infinity. The same is true for a microscope focused for the relaxed eye. See: distance of virtual image. (05 Aug 1998) |
| distance of virtual image | <physics> When a simple lens is used as a magnifier for visual observation the eye becomes part of the optical system. A virtual image can be formulated by construction and its apparent distance will vary with the focus of the eye. This will vary among individuals. In a rather arbitrary but standardised assumption, the normal distance for close observation, or reading has been set at 10 inches (250 mm). The optics for the compound microscope have been designed to furnish parallel light from the eyepiece so that the eyes are relaxed for distant viewing. This makes the virtual image lie at infinity. Tests showed that the average observer accommodates somewhat, placing the virtual image rather variably, often about 20 - 25 feet. (05 Aug 1998) |
| image virtual | <microscopy> A virtual image has no real existence. It is the image seen when looking into a mirror. The field of view of the microscope is a good example of a virtual image. When the eye operates in conjunction with a lens to form an image on the retina, the visual sensation is as if the image existed in space. That its apparent location is very definite is proved when a pin can be made to coincide with the mirror (virtual) image of another pin that is seen by looking at a sheet of glass acting as a mirror. With a lens system a virtual image can be definitely located as by graphically tracing rays back to a focus. In a microscope, if the eye is relaxed as it should be, the virtual image will be at infinity. Measurements show that most observers place the aerial image at 20-25 feet, some as close as seven, because of partial accommodation. (11 Mar 1998) |
| active treatment | A therapeutic substance or course intended to ameliorate the basic disease problem, as opposed to supportive or palliative treatment. Compare: causal treatment. (05 Mar 2000) |
| aerobic waste treatment | The used of aerobic microbes to break down raw sewage. (09 Oct 1997) |
| palliative treatment | <oncology> Treatment to relieve symptoms of the disease but not to cure it. Frequently takes the form of making the patient more comfortable through pain management. (16 Dec 1997) |
| maintenance treatment | Treatment given for a period of months or years to maintain remission and eliminate any residual leukaemic cells in the body, usually for acute lymphoblastic leukaemia. (13 Nov 1997) |
| Carrel's treatment | Treatment of wound surfaces by intermittent flushing with Dakin's solution. Synonym: Dakin-Carrel treatment. (05 Mar 2000) |
| causal treatment | Treatment aimed at reversing the causal factor in a disease. (05 Mar 2000) |
| glaucoma treatment | A laser beam of light is focused on the part of the anterior chamber where the fluid leaves the eye. This results in a series of small changes, which makes it easier for fluid to exit the eye. Over time, the effect of laser surgery may wear off. Patients who have this form of surgery may need to keep taking glaucoma drugs. Although glaucoma cannot be cured, it can usually be controlled. Medical treatment can be in the form of eyedrops or pills. Some drugs are designed to reduce pressure by slowing the flow of fluid into the eye, while others help to improve fluid drainage. The regular use of medications usually controls the increased fluid pressure. However, these drugs may stop working over time or they may cause side effects so that the eye care professional may select other drugs, change the dose, or use other means to deal with the glaucoma. Surgery can also help fluid escape from the eye and thereby reduce the pressure. However, surgery is now usually reserved for patients whose pressure cannot be controlled with eyedrops, pills, or laser surgery. (12 Dec 1998) |
| medical treatment | Treatment of disease by hygienic and pharmacologic remedies, as distinguished from invasive surgical procedures. (05 Mar 2000) |
| centralised sewage treatment | <ecology> The collection and treatment of sewage from many sources to remove pollutants and pathogens. (05 Dec 1998) |
| residential treatment | A specialised residential treatment program for behaviour disorders including substance abuse. It may include therapeutically planned group living and learning situations including teaching of adaptive skills to help patient functioning in the community. (12 Dec 1998) |
| Goeckerman treatment | A treatment for psoriasis; the involved areas are painted with a solution of coal tar, or are covered with crude coal tar ointment and subsequently irradiated with ultraviolet (UVB). (05 Mar 2000) |
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