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The Four Prism Dioptre Reflex Test (also known as the 4 PRT, or 4 Prism Dioptre Base-out Test) is an objective, non-dissociative test used to prove the alignment of both eyes (i.e. the presence of binocular single vision) by assessing motor fusion. [1]
The double-Amici prism is a symmetric form of the more general triplet prism, in which the apex angles and glasses of the two outer elements may differ (see the figure at right). Although triplet prisms are rarely found in optical systems, their added degrees of freedom beyond the double-Amici design allow for improved dispersion linearity.
Upside down goggles can be used to demonstrate human adaptation to inverted vision, and as a method of preventing motion sickness. [2] Hubert Dolezal recommended using upside down goggles for "nausea adaptation" for space travel. [3] They can also be used to train spatial abilities and possibly cognitive functions. [Patents of devices 1]
Huygens principle of double refraction, named after Dutch physicist Christiaan Huygens, explains the phenomenon of double refraction observed in uniaxial anisotropic material such as calcite. When unpolarized light propagates in such materials (along a direction different from the optical axis ), it splits into two different rays, known as ...
These are low dispersion glass, most notably, glasses containing fluorite. These hybridized glasses have a very low level of optical dispersion; only two compiled lenses made of these substances can yield a high level of correction. [9] The use of achromats was an important step in the development of optical microscopes and telescopes.
Other common-path interferometer configurations have been described in the literature, such as the double-focus interferometer and the Saunders's prism interferometer, [15] and many others. Common-path interferometers have proven useful in a wide variety of applications including optical coherence tomography, [ 1 ] digital holography, [ 35 ...
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