Purpose: To determine the efficiency of mapping out the field of single binocular vision in patients with incomitant strabismus using a modification of the Lancaster Test (Matta Map).
Methods: The Matta Map is a simple variant of the Lancaster Screen in which a patient does not use the red-green fusion-dissociating spectacles while tracking a projected target and reporting if it is single or doubled in the nine cardinal positions of gaze. With this tool, we are able to map out the field of single binocular vision. Multiple patients with various types of incomitant strabismus were evaluated. Some patients with stable incomitant strabismus underwent multiple evaluations over time to assess reproducibility of results.
Results: The Matta Map appears to be very useful in measuring the field of single binocular vision. The results are reproducible and consistent with the patient's incomitant strabismus and symptoms.
Conclusion: The Matta Map is a rapid, quick, inexpensive and reliable method for measuring a patient's field of single binocular vision and to follow a patient's symptoms and their progress over time.