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The PFR is performed in bright lighting conditions at near (33 cm) or far (6m), using prism bars (horizontal and vertical) and an accommodative fixation target such as a letter on a fixation stick for near, or a Snellen Chart letter for distance. [5]
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 level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks. It is widely used in surveying and construction to measure height differences ...
The following is a list of second moments of area of some shapes. The second moment of area, also known as area moment of inertia, is a geometrical property of an area which reflects how its points are distributed with respect to an arbitrary axis. The unit of dimension of the second moment of area is length to fourth power, L 4, and should not ...
Maddox rod. The Maddox rod test can be used to subjectively detect and measure a latent, manifest, horizontal or vertical strabismus for near and distance. The test is based on the principle of diplopic projection. [1]
For example, {4}× {4}, a 4-4 duoprism is a lower symmetry form of a tesseract, as is {4,3}× { }, a cubic prism. {4}× {4}× { } (4-4 duoprism prism), {4,3}× {4} (cube-4 duoprism) and {4,3,3}× { } (tesseractic prism) are lower symmetry forms of a 5-cube .