Here, the eyes are dissociated by using either coloured filters or a mirror. The system is arranged so that a screen is viewed with one eye and the end of a pointer with the other. The patient is told to place the pointer on various points on the screen. If the eyes are not straight, the pointer is placed away from the correct position. A map of the incorrect positions is made (Figure 14.5). The shape of the map is diagnostic of particular ocular muscle problems and serial records can be helpful in assessing progress.
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