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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 ...
Fixation disparity. Fixation disparity is a tendency of the eyes to drift in the direction of the heterophoria. While the heterophoria refers to a fusion-free vergence state, the fixation disparity refers to a small misalignment of the visual axes when both eyes are open in an observer with normal fusion and binocular vision. [1]
A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2] Thus a prism of 1 Δ would produce 1 cm visible displacement at 100 cm, or 1 metre. This can be represented mathematically as: = where is the amount of prism correction in prism dioptres, and is the angle of deviation of the light.
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]
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The hot-filament ionization gauge, sometimes called a hot-filament gauge or hot-cathode gauge, is the most widely used low-pressure (vacuum) measuring device for the region from 10 −3 to 10 −10 Torr. It is a triode, with the filament being the cathode . Note: Principles are mostly the same for hot-cathode ion sources in particle ...
The sporty GSi model of 1990–1992 was notable for its 130 hp (97 kW) twin-cam engine, sport suspension, disc brakes, and 14-inch wheels, which made it as a spiritual successor to the 1988 Chevrolet Nova twin-cam but less of a limited edition, available in both body styles and a full array of colors compared to the earlier model's black-only ...
General Electric GEnx. Engine Alliance GP7000. General Electric GE9X. The General Electric GE90is a family of high-bypassturbofanaircraft enginesbuilt by GE Aerospacefor the Boeing 777, with thrust ratings from 81,000 to 115,000 pounds-force(360 to 510 kilonewtons). It entered service with British Airwaysin November 1995.