Directional Coordimetry is a modified protocol of Classic Coordimetry.
Classic Coordimetry is a test used to study oculomotor palsy. Classic Coordimetry is carried out in spirals where coherent shifts in localisation can be observed in cases of oculomotor palsy. Directional Coordimetry is used to study the Postural Deficiency Syndrome/ Proprioception Dysfunction Syndrome (PDS).
Directional Coordimetry is carried out line by line, right to left and left to right; and up – down and down – up. In PDS, shifts of localisation that are not coherent relative to one another, can be observed using Directional Coordimetry (Figure 2).
Figure 2. Directional Coordimetry of a Postural Deficiency Syndrome/ Proprioception Dysfunction Syndrome patient without Active Prisms and with Active Prisms from left to right and from right to left
Using Directional Coordimetry it can be observed that Active Prisms correct the localisation incoherencies, but the images are not shifted by the prismatic power. These results are unexpected when compared with those normally obtained in Classic Coordimetry. Directional Coordimetry indicates that the potency of the Active Prisms has been absorbed by the oculomotor system.