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Showing posts from May, 2020Show all
Light
DOMINANT EYE TEST
The second phase of the clinical refraction starts when the complete process of first phase is carr…
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Retinoscopy
Light
Instrumentation
Vision
Near visual acuity test
Near visual acuity test is usually done at a distance within arm’s length. A distance of 40cm is us…
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Refraction
Phoropters
Modern Phoropters or refractors are an alternative to trial lens set. All the lenses in the phoropt…
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Instrumentation
MADDOX ROD
Maddox Rod is a group of either red or colorless parallel rods taken together act as a cylinder (Fi…
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Lense
RED AND GREEN LENS
The standard trial lens set also contains one red and one green filter lens (Fig. 2.5). Some trial …
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Instrumentation
STENOPAIC SLIT
Stenopaic slit is an elongated pinhole (Fig. 2.4) which is used to allow the light transmission in …
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Instrumentation
PINHOLE DISK
Fig:- Pinhole Pinhole disk is a small disk with central opening that prevents peripheral rays of li…
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Instrumentation
PRISM LENSES
Fig:- Prism Prism lenses are triangular or wedge-shaped piece of glass or plastic that displaces th…
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