As people grow old, how do their eyes change?
Their eyes change so that they see objects at a distance better than those which are nearer, hence, in reading they hold a book farther from the eye.
The Eye.
What is that part of the eye called, which is blue, gray, or brown, in different persons?
It is called the iris.
What is the pupil of the eye?
The pupil is the black spot or hole in the centre of the iris.
Fig. 11.
What is the use of the pupil?