Minute particles of foreign substances, such as thorns, the outer covering of various seeds, etc., are liable to gain admission into the eyes.

If the glume of an oat seed, etc., lodges on the cornea, it may remain adherent, setting up inflammation of it. Blindness is a common result.

When the cornea is punctured, it is advisable to have professional advice.

After the removal of a foreign body—best done by turning the upper lid outwards and upwards with the fingers—insert a drop or two of castor oil daily for a few days, or as long as seems necessary. Severe injuries to the eyeball are liable to be followed by sympathetic inflammation in the sound eye.