Lethata optima is a moth of the family Depressariidae. It is found in Peru."Lethata Duckworth, 1964" at Markku Savela's Lepidoptera and Some Other Life Forms
The wingspan is about 34 mm. The forewings are greyish overcast with reddish brown especially in the anal area and with the costa narrowly ochreous. The termen is ochreous with a purplish spot at the end of the cell with scattered white scales. The entire wing with scattered fuscous scales. The hindwings are whitish overcast with grey.Proceedings of the United States National Museum 122 (3585): 18
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