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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 ...
Double Porro prism or Porro 1 optical system. Porro prisms are most often used in pairs, forming a double Porro prism. A second prism rotated 90° with respect to the first, is placed such that light will traverse both prisms. The net effect of the prism system is a beam parallel to but displaced from its original direction, with the image ...
Exophthalmometer. An exophthalmometer is an instrument used for measuring the degree of forward displacement of the eye in exophthalmos. The device allows measurement of the forward distance of the lateral orbital rim to the front of the cornea. [1] Exophthalmometers can also identify enophthalmos (retraction of the eye into the orbit), a sign ...
Geometrical optics, or ray optics, is a model of optics that describes light propagation in terms of rays. The ray in geometrical optics is an abstraction useful for approximating the paths along which light propagates under certain circumstances.
BDSM is a variety of often erotic practices or roleplaying involving bondage, discipline, dominance and submission, sadomasochism, and other related interpersonal dynamics. Given the wide range of practices, some of which may be engaged in by people who do not consider themselves to be practising BDSM, inclusion in the BDSM community or ...
Eyeglass prescription. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient. If an eye examination indicates that corrective lenses are appropriate, the ...
SWAROVSKI OPTIK, headquartered in Absam, Tyrol, Austria is part of the Swarovski group of companies. Founded in 1949, the Austrian company specialises in the development and manufacturing of long-range optical instruments in the premium segment of the market, including binoculars, telescopes ( spotting scopes ), rifle scopes, range finders and ...
Information science. Information technology ( IT) is a set of related fields that encompass computer systems, software, programming languages, and data and information processing, and storage. [1] IT forms part of information and communications technology (ICT). [2] An information technology system ( IT system) is generally an information ...