Maddox Rod Test

Why we do ?

The “Maddox Rod Test” is used to test for horizontal and vertical deviations

Requirements

Maddox rod

Maddox tangent scale

Fig:- Maddox Rod

Fig:- Maddox tangent scale

How We do

1. Patient is asked to fix on a point light in the centre of Maddox tangent scale at a distance of 6 metres.
2. A Maddox rod is placed in front of one eye with axis of the rod parallel to the axis of deviation.
3. The Maddox rod converts the point light image into a line. Thus, the patient will see a point light with one eye and a red line with the other.
4. The number on Maddox tangent scale where the red line falls will be the amount of heterophoria in degrees.

 

To Test For Horizontal Deviations

1. The Maddox rod is placed in front of one eye (for this example, the Left eye) with the cylinders in the horizontal direction.
2. The patient fixates a point source of light and then sees a vertical line with the Left eye and a white light with the Right eye.

Fig:- Interpretation of Horizontal Deviation

To Test For Vertical Deviations

1. The Maddox rod is placed in front of one eye (for this example, the Left eye) with the cylinders in the Vertical direction.
2. The patient fixates a point source of light and then sees a Horizontal line with the Left eye and a white light with the Right eye.

Fig:- Interpretation of Vertical Deviation

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