[Quadrant pattern visual evoked potential in normal eyes].

OBJECTIVE

The study was designed to approach the difference in pattern visual evoked potential (PVEP) among quadrants of the normal eye.

METHODS

Quadrant transient PVEP method was used to record quadrant PVEP for 70 eyes of 35 normal subjects.

RESULTS

The latency of P100 in lower temporal and lower nasal fields was significantly shorter than that in upper temporal and upper nasal fields; the amplitude of P100 in lower temporal and lower nasal fields was significantly higher than that in upper temporal and upper nasal fields. Generally, in lower field, the P100's latency is shorter and its amplitude higher.

CONCLUSION

The difference in P100 between upper and lower field of normal person is possibly related to the fact that the lower field is used more frequently than the upper in ordinary human or animal life, and to the differences in distribution of retinal ganglion cells and in retina-cortex pathway between the upper and lower retina.