Also, does the size of the deviation matter when determining the management options?
As the patient is asymptomatic, leave well alone. Such patients often have large deviations and would need such a big prism to make them binocular that it becomes totally impractical. In general size is important when determining management options, particularly when considering prisms or surgery. Q: We have recently changed our testing charts to electronic screens which are not polarised, thus dissociation is carried out by using coloured filters. I am finding when using fixation disparity on Px’s presenting with large phoria’s and symptoms of decompensation, the Px finds it very difficult to understand the test. It seems that the filters are not really dissociating the eyes, resulting in too many green, red and black lines.
