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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]
A mesh is a representation of a larger geometric domain by smaller discrete cells. Meshes are commonly used to compute solutions of partial differential equations and render computer graphics, and to analyze geographical and cartographic data. A mesh partitions space into elements (or cells or zones) over which the equations can be solved ...
Uniform hexagonal prism Type: Prismatic uniform polyhedron: Elements: F = 8, E = 18, V = 12 (χ = 2) Faces by sides: 6{4}+2{6} Schläfli symbol: t{2,6} or {6}×{} Wythoff symbol: 2 6 | 2 2 2 3 | Coxeter diagrams: Symmetry: D 6h, [6,2], (*622), order 24 Rotation group: D 6, [6,2] +, (622), order 12 References: U 76(d) Dual: Hexagonal dipyramid ...
The Krimsky test is essentially the Hirschberg test, but with prisms employed to quantitate deviation of ocular misalignment by determining how much prism is required to centre the reflex [2] The Krimsky test is advisably used for patients with tropias, but not with phorias.
Its prism has 2n vertices, 3n edges, and 2 + n faces. Take a polyhedron with V vertices, E edges, and F faces. Its prism has 2V vertices, 2E + V edges, 2F + E faces, and 2 + F cells. Take a polychoron with V vertices, E edges, F faces, and C cells. Its prism has 2V vertices, 2E + V edges, 2F + E faces, 2C + F cells, and 2 + C hypercells ...
Right rhombic prism: it has two rhombic faces and four congruent rectangular faces. Note: the fully rhombic special case, with two rhombic faces and four congruent square faces (= =), has the same name, and the same symmetry group (D 2h, order 8). For parallelepipeds with C 2h symmetry, there are two cases:
Let the height be h, internal radius r, and external radius R. The volume is given by The volume is given by V = π ( R 2 − r 2 ) h = 2 π ( R + r 2 ) h ( R − r ) . {\displaystyle V=\pi \left(R^{2}-r^{2}\right)h=2\pi \left({\frac {R+r}{2}}\right)h(R-r).}
In geometry, a triangular prism or trigonal prism is a prism with 2 triangular bases. If the edges pair with each triangle's vertex and if they are perpendicular to the base, it is a right triangular prism. A right triangular prism may be both semiregular and uniform. The triangular prism can be used in constructing another polyhedron.
the formula for the volume can be expressed as the third of the product of this proportionality, , and of the difference of the cubes of the heights h 1 and h 2 only: V = h 1 α h 1 2 − h 2 α h 2 2 3 = α h 1 3 − h 2 3 3 . {\displaystyle V={\frac {h_{1}\alpha h_{1}^{2}-h_{2}\alpha h_{2}^{2}}{3}}=\alpha {\frac {h_{1}^{3}-h_{2}^{3}}{3}}.}
Cavalieri's principle. This file represents the Cavalieri's Principle in action: if you have the same set of cross sections that only differ by a horizontal translation, you will get the same volume. In geometry, Cavalieri's principle, a modern implementation of the method of indivisibles, named after Bonaventura Cavalieri, is as follows: [1]