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Module 29 |
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Module 29: Section 2: |
EOM Related Skills: The Red Lens Test |
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| The red lens test
is an aid to the evaluation of double vision, especially when the
deviation is slight. A red lens is placed over the right eye and
the patient looks at a point light source with both eyes. If the
patient has double vision, she will see a red light separated from a
white light light. The patient is asked to describe the relative
positions of the two lights in the nine diagnostic positions of gaze.
The separation between the two lights will be greatest in the field of action of the muscle that is under-acting (weak). The image seen by the eye with the weak muscle will appear to be more peripheral. The fields of action are diagramed below:
Example: Suppose the red and white lights look farthest apart to the patient when gazing left. From the diagram, we see that the RMR and the LLR are involved with left gaze. The patient reports that the white light appears farther to the left than the red light is. The red lens is in front of the right eye. Therefore, the LLR must be under-acting. |
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