In this disease the sight is perfectly clear and distinct in the daytime, but a total blindness takes place by night.

This disorder is peculiar to the inhabitants of tropical climates and the southern parts of Europe, being seldom if ever met with in cold countries. It seldom proves a disease of much importance or of long duration.

Blisters applied to the temples, and repeated occasionally, with the sulphate of Zinc Lotion; and attention to the general health, and protecting the eyes with a green shade in the daytime, will generally-unless the complaint depends on Scurvy-effect a. cure.