Combining Donepezil With Perceptual Learning in Normal and Amblyopic Human The Effect of Donepezil on Perceptual Learning in Adult Amblyopia

Donepezil will be administered to subjects three days before each training, and during training, to evaluate if donepezil improves the effectiveness of training.

Subjects will undergo training to identify single letters (10,000 trials, or 10 blocks per session for 10 sessions).

Subjects will undergo training to identify letters closely flanked by other letters (10,000 trials, or 10 blocks per session for 10 sessions).