Be "vision smart" when using a smartphone

Many people spend time at night reading their smartphones in bed while lying on one side with the eye that is positioned on the pillow being covered by the pillow. This habit can cause eye strain and lead to the "reading" eye taking longer to adapt to the dark when the smartphone is no longer in use. This phenomena has even been given a name: transient smartphone blindness. It is caused by the "covered" eye being adapted to the dark and the "reading" eye being adapted to the bright screen of the phone. When the phone is removed, the "reading" eye has to adjust to the darkness and this can take several minutes. While the American Academy of Ophthalmology doesn't consider this a serious problem and doesn't consider it an official medical condition, it is recommended that people look at their phones with both eyes.*