In order to avoid dimness of sight, when they plunge into cold water,
people ought to open their eyes wide, for thereby the strength of their
eyes will be much improved. They ought also to be careful not to hurt
them by reading. Let them also avoid wine that is thick and sweet, such
articles of food as ascend upwards, whatever is of difficult digestion,
and engenders crude and thick humours, the herb rocket, leeks, and
everything whose pungency ascends upwards. Let them also avoid reclining
long in a supine position, cold, winds blowing direct in the face, smoke
and dust; and pour daily into the eyes an infusion prepared thus: for a
month and a day, put green fennels into an earthen vessel smeared with
pitch on the outside, and pour in rain water, and then taking out the
fennels, keep the water laid up for use.
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