MADDOX DOUBLE PRISM'S ROD
\mˈadɒks dˈʌbə͡l pɹˈɪzəmz ɹˈɒd], \mˈadɒks dˈʌbəl pɹˈɪzəmz ɹˈɒd], \m_ˈa_d_ɒ_k_s d_ˈʌ_b_əl p_ɹ_ˈɪ_z_ə_m_z ɹ_ˈɒ_d]\
Definitions of MADDOX DOUBLE PRISM'S ROD
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A glass rod, or series of parallel glass rods, set in the center of an opaque disc; when held in front of one eye it converts the image of a candle into a streak of light, and the position of this streak in relation to the image of the candle seen by the other eye indicates the presence and degree of heterophoria.
By Stedman, Thomas Lathrop