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No local treatment is called for except the shading of the eyes and in most cases the use of a mydriatic to prevent synechiae when the iris is involved.

If you happen to remember your botany, you’ll recall that its longer name is Datura stramonium—and it’s a strong mydriatic.

They are all, like atropine, mydriatic alkaloids, so-called from the effect on the eye.

The thing puzzled me until I recalled that the Latin name of jimson weed is Datura stramonium; then, in a flash, it came to me that stramonium is a powerful mydriatic.

It may be explained for the sake of our student readers that the word mydriatic is derived from the Greek mudriasis, which means paralysis of the pupil.