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Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.
Diplopia is the simultaneous perception of two images of a single object, which may be voluntary or involuntary. It can result from various ophthalmologic, neurological, or systemic disorders, and can be classified as monocular or binocular, acute or chronic, and suppressed or not.
Learn about the different types of optical prisms, such as dispersive, reflective, beam-splitting and polarizing prisms, and how they refract, reflect or split light. Find out how prisms are made of transparent materials like glass, acrylic or fluorite, and how they can create spectra, images or polarizations.
Learn about binoculars or field glasses, two refracting telescopes aligned to point in the same direction, allowing binocular vision. Compare different optical designs, such as Galilean, Keplerian, Porro and roof prism, and their advantages and disadvantages.
Learn about the surgical options to correct the misalignment of the eyes caused by strabismus, a condition that affects the extraocular muscles. Find out how the procedures are performed, what indications they have, and when they were first developed.
Eye glasses with an included prism power is the optical method to reduce a fixation disparity. Different procedures have been proposed to determine the required amount of prism for the individual. Based on prism-FD curves (Fig. 3b), one can find the aligning prism sP 0 that nullifies the naturally prevailing fixation disparity sFD 0. This test ...
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.
A Porro prism is a reflection prism that rotates and displaces an image by 180°. It is used in optical instruments such as binoculars, telescopes and cameras, and has different variants and designs.
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