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OPTOM FASLU MUHAMMED , profile picture
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Maddox rod

The Maddox rod is an optometric tool used to detect heterophoria. It consists of a series of cylindrical lenses mounted in a trial frame that produces an elongated streak of light. When viewed through the Maddox rod, a point of light appears as a streak. The Maddox rod test is used to detect and measure horizontal and vertical deviations by placing the rod in front of one eye and having the patient view a fixation light. The position of the streak relative to the light indicates the type of deviation, and prisms are used to measure the degree. It is a simple and useful test to perform in office for evaluating eye alignment.

Healthcare◦
MADDOX ROD OPTOM FASLU MUHAMMED
 It is based on the principle of dissociation  Maddox Rod consists of a series of plano cylinder lenses about 3mm in diameter, mounted in a trial frame lens or in a refractor head  A spot of light viewed through the Maddox rod appears as an elongated streak  The Maddox rod is often colored usually red.
USES  Used to find out presence of heterophoria .  Easy for patient to understand  Easy to administer  Very useful for vertical deviation  May be done in free space
MADDOX ROD TEST  Equipment required are (1) Maddox rod (2) Small fixation light (3) Prism(to asses the degree of deviation)
PROCEDURE  Reduce room illumination  Maddox rod is placed in front of one eye  Measuring horizontal deviations Maddox rod axes are placed horizontal which produces vertical streak  Measuring vertical deviations Maddox rod axes are placed vertical which produces horizontal streak  Patient initially views with both eyes open
PROCEDURE FOR HORIZONTAL DIVIATION  Maddox rod is placed horizontally(vertical streak) in front of right eye  With strabismics,the Maddox Rod is best placed over the fixating eye.  Ensure that patient can see white light and streak simultaneously  Ask if the streak is to the right or to the left of the light.
 With Maddox Rod in front of the right eye  If the vertical streak of line passes directly through the centre of the spot light it indicates orthophoria  If the vertical streak of light appears to the left of the spot light it indicates exophoria.  If the vertical streak of light appears to the right of the streak light it indicates esophoria.
 The amount of deviation can be assessed by placing prism bar in front of the eye.  Place base out for eso and base in for eso deviation.  Keep on increasing the strength of the prism until the streak of the light passes through the centre of the prism.  The strength of the prism indicates the amount of deviation present.
FOR VERTICAL DIVIATION  Same procedure is followed expect Maddox rod is placed with its axes vertically producing horizontal streak of light  If the horizontal streak of light is above the fixation light it indicates presence of hypo deviation  If the horizontal streak of light is below the fixation light it indicates presence of hyper deviation.