The prescription of weak prisms may induce monocular diplopia or binocular triplopia. The monocular double image is due to internal reflexion at the glass-air interface. The intensity of the secondary image is very weak (0.2% of the primary image). The prismatic deflection of the secondary image is six times the deflection of the primage image.
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| http://dx.doi.org/10.1007/BF02387415 | DOI Listing |
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