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Biprism

Biprism (Latin bis – two, twice, double + the Greek prisma – sawn, which are sawn off; synonym: Gershelya a biprism) – the device used at squint for a research of a condition of outside muscles of an eye; represents two prisms of identical forces which are deployed in the general frame one by one and are capable to rotate in opposite directions around the general axis.

 
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