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Clock time is indicated on the horizontal axis along the top of each actogram. Lights on/off are indicated by light and shaded areas of the actogram. Hamsters were subjected to the following occlusion treatments for 38 weeks: A a clear lens over the right eye (CR), B an occluder over the right eye (BR), C an occluder over the left eye (BL), or D occluders over both eyes (BB).
