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In page Heterophoria:

"

Ernest Maddox studied different types of phoria extensively throughout his career. He developed the Maddox rod test and double Maddox rod test which are especially sensitive to deviations of the eye. The tests must be performed in low light conditions, with a dim point light source in an environment absent of specular surfaces. The test came under heavy criticism during WW1 for its lack of accuracy however it was discovered that operators had simply allowed too much light in the test room and had used a light source that was too bright.[1] Even low levels of light stimulate fusion which is why it is imperative to perform the test with the minimum amount of light in order for the patient to observe a misalignment.[citation needed]