Eye-strain is to be prevented by scientifically adapted spectacles, by

care to secure the right kind of illumination, and in some cases by
systematically resting the eyes
Eye-strain is to be prevented by scientifically adapted spectacles, by
care to secure the right kind of illumination, and in some cases by
systematically resting the eyes. Reading on moving trains or looking for
a long time at moving pictures may overstrain the eye. One should be
especially careful not to read in a waning light or, on the other hand,
to read in the glare of the sun. If one works facing a window, it is
advisable to wear an eye-shade; otherwise there is a struggle between
the tendency of the bright light to close the pupil and the tendency of
the work requirement to keep it open.


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