[...A very remarkable patient, a girl aged eight, was treated more
than fifteen years ago. The vision of the right eye was 2/200 while
that of the left eye was 10/200. The right eye turned in most of the
time. The vision of the left eye was improved without glasses by
alternately resting the eyes.

An attempt was made to teach her how to see best where she was
looking. She very soon acquired the ability to practice central
fixation when the larger letters were regarded. The child became much
interested when she realized that her eyes felt better, while the
vision and strabismus improved. She practiced central fixation on
smaller letters and other objects. The strain which was manifest by
the contortions of the muscles of her eyes, face, and other parts of
her body disappeared. Her voice became more musical with the
improvement of her vision and the subsidence of the strabismus.

It was remarkable how well she became able to practice central
fixation on very small letters and other objects. She would hold a
glass slide on which a small drop of blood was mounted, and claim that
she saw the red cells, the white cells, and other minute particles
with her right eye while the glass slide was pressed against her
eyelashes. She was able to read each letter and period in photographic
reductions of the Bible, by central fixation...]

- Dr. W.H. Bates, March 1930