Figure 5. Retina outer nuclear layer (ONL) thickness from rats fed for three weeks under cyclic dim light. The ONL thickness measured in μM at each defined area from superior to inferior through optic nerve. There is no significant difference in ONL thickness of caffeic acid phenethyl ester (CAPE)-fed retina and control-fed retina (p>0.05, with the Student t test; n=8). Cont+DL: control diet under cyclic dim light; CAPE+DL: CAPE diet under cyclic dim light.