The imaging characteristic of a curved (curvature &rgr;) light‐focusing plastic rod (LFR), with a constant quadratic gradient of refractive index and radiusrpis examined. It was found that curving a LFR produces limitation in the image field, and that the extent of the limiation is inversely proportional toarp&rgr; according to a relation derived theoretically. In the case of a partially curved LFR, the image location was found to shift periodically with increase in the curved portion.