Markov bar test
It is mainly used to check recessive strabismus. The Maddock rod (abbreviated as Markov rod) is composed of multiple small glass rods arranged in parallel with each other. Because the lenticular lens has the property that the light parallel to its axis passes without inflection and the light perpendicular to the axis is refracted, the light source is viewed through the Markov rod (Dotted) becomes a light bar perpendicular to the cylinder axis.
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