Figure 8. Measurement of retina outer nuclear layer (ONL) thickness from rats fed for eight weeks with control and caffeic acid phenethyl ester (CAPE) diet. The ONL thickness measured in μM at each defined area from the superior to the inferior through the optic nerve. There is no significant difference between the ONL thickness of the caffeic acid phenethyl ester (CAPE)-fed retina and the control-fed retina either from cyclic dim light (DL) or from cyclic bright light (BL) (n=12/group; p>0.05, with the Student t test). However, bright light rearing reduced the ONL thickness significantly from dim light rearing. Cont+DL: control diet under cyclic dim light; CAPE+DL: CAPE diet under cyclic dim light; Cont+BL: control diet under cyclic bright light; CAPE+BL: CAPE diet under cyclic bright light.