Lethata optima is a moth of the family Depressariidae.
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.
This article on a moth of the subfamily Stenomatinae is a stub.