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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 ...
A fixation disparity is not constant within a certain observer, but can vary depending on the viewing conditions. If test prisms with increasing amount are placed in front of the observer’s eyes, the fixation disparity changes in the eso direction with base-in prisms and in the exo direction with base-out prisms (Fig. 3).
Exophoria. Exophoria is a form of heterophoria in which there is a tendency of the eyes to deviate outward. [1] During examination, when the eyes are dissociated, the visual axes will appear to diverge away from one another. [2] The axis deviation in exophoria is usually mild compared with that of exotropia.
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 ...
The Northern Ireland Association of Aeromodellers (NIAA) is the governing body for all British Model Flying Association (BMFA) affiliated clubs in Northern Ireland.The NIAA committee is elected by, and from representatives of the local Northern Ireland flying clubs, with an aim to promote, protect, organise and encourage model aircraft flying throughout Northern Ireland.
Prism (geometry) In geometry, a prism is a polyhedron comprising an n-sided polygon base, a second base which is a translated copy (rigidly moved without rotation) of the first, and n other faces, necessarily all parallelograms, joining corresponding sides of the two bases. All cross-sections parallel to the bases are translations of the bases.
International Miniature Aerobatic Club (IMAC) is a non-profit organization devoted to flying scale aerobatic model aircraft. IMAC is the main governing body responsible for hosting precision aerobatic contests with hundreds of pilots across the United States and Eastern Canada. The organization was founded in 1974 with 97 chartered members.
The Model Aeronautical Association of Australia Inc (MAAA) is an organisation recognised by the Civil Aviation Safety Authority (CASA) as a Recreational Aviation Administration Organisation (RAOO). MAAA has no regulatory authority conferred to it by the CASA, however it is required under a Deed of Agreement with CASA as an RAAO, to carry out ...