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Maddox' rod
Also known as:
Baguette de Maddox (French)
Maddox' cylinder
Maddox' prism
Associated persons:
Ernest Edmund Maddox
Description:
The Maddox rod is used to help delineate and characterize dysconjugate gaze. It is a disc of red glass in which are molded grooves.
When the patient views a distant spot of light with the disc in front of one eye, a red line will be seen by the eye covered with the lens, whilst a spot of light will be seen with the other eye.
The line will be at right angles to the grooves so that when these are horizontal the line will appear vertical. A candidate with no latent deviation will see the coloured line pass through the spot of light (orthophoria), whereas a candidate with latent squint will see the light source to one side of the line.
Bibliography:
- E. E. Maddox:
A New Test for Heterophoria (Maddox rod).
Ophthalmic Review, London, May 1890, 129: 487.
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