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Transcatheter pulmonary valve replacement ( TPVR ), also known as percutaneous pulmonary valve implantation ( PPVI ), is the replacement of the pulmonary valve via catheterization through a vein. It is a significantly less invasive procedure in comparison to open heart surgery and is commonly used to treat conditions such as pulmonary atresia.
The prism cover test ( PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]
The prism fusion range ( PFR) or fusional vergence amplitude is a clinical eye test performed by orthoptists, optometrists, and ophthalmologists to assess motor fusion, specifically the extent to which a patient can maintain binocular single vision ( BSV) in the presence of increasing vergence demands. Motor fusion is largely accounted to ...
More than 60 veterans of World War II took off Friday from Dallas to France, where they will take part in ceremonies marking the 80th anniversary of D-Day. The group ranges from 96 to 107 years ...
Greg Brown, the CEO of Motorola, a leader in providing and provisioning private communications networks for public safety and first responders in North America and around the world, across 911 ...
A sarcophagus discovered in 2009 in the burial chamber of an Egyptian high priest was originally from the tomb of pharaoh Ramesses II, according to a new study.
The strength of the prism is increased until the streak of the light passes through the centre of the prism, as the strength of the prism indicates the amount of deviation present. The Maddox rod is a handheld instrument composed of red parallel plano convex cylinder lens , which refracts light rays so that a point source of light is seen as a ...
Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]