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In the present study, a feline model of strabismic amblyopia was established during a sensitive developmental period, and the influence of levodopa methyl ester and levodopa on nerve growth factor expression in the visual cortex (area 17) was compared. Pattern visual-evoked potential and immunohistochemistry results showed that levodopa methyl ester and levodopa treatment shortened P100 wave latency, increased P100 amplitude, and increased the number of endogenous nerve growth factor-positive cells in visual cortex levels. In particular, the effects of levodopa methyl ester were superior to levodopa treatment.