Light should fall from behind and above: it should be equal
for both eyes. An Argand lamp is best. Reading out-of-doors
is harmful. The range of the eye should not be too short.
Frequent rests do good. Light should be strong enough. The
easiest reading should be saved for the evening. Reading
during convalescence is hurtful. How to remove foreign
substances from the eye. Cleanliness essential. 155