"9. The bedroom blinds should be red or gray, and the head of the bed should be toward the window.
"10. Those ladies who not only write but sew should not attempt the black seam by night.
"11. When you come to an age that suggests the wearing of spectacles, let no false modesty prevent you from getting a pair. If you have only one eye, an eye-glass will do; otherwise it is folly.
"12. Go to the wisest and best optician you know of and state your wants and your case plainly, and be assured you will be properly fitted.
"13. Remember that bad spectacles are most injurious to the eyes, and that good and well-chosen ones are a decided luxury.
"14. Get a pair for reading with, and if necessary a long-distance pair for use outdoors."
Further rules are:—
Avoid all sudden changes between light and darkness.
Never begin to read, write, or sew for several minutes after coming from darkness to a bright light.
Never read by twilight or moonlight, or on dark, cloudy days.