UPDATED FROM JUNE 23, 2016
Some people are being evaluated for stroke or transient ischemic attacks when they come to the ER complaining of recurrent “temporary blindness” after checking their smartphone in the dark. This phenomenon, known as ‘smartphone blindness’, has been experienced by many of us when we have the sensation of dimmed vision or poor visual acuity, feeling punished for peeking at our email when we should be sleeping.
In 2016, doctors reviewed the cases of two women who experienced episodes of “temporary blindness”; as the ladies put their cell phone down, one eye could not see the cell phone for 15 minutes. Their vision restored after this length of time.Doctors investigated the cases thoroughly with a variety of medical tests including MRI’s and couldn’t find the cause.
Finally they conclude these transient episodes of “vision loss” were harmless, in that one eye was being used to look at the phone and the other eye needed time to “catch up”. When the women, as many of us do, check our phones, one eye is snugly closed and resting on a pillow while the other is available to look at the phone. When the ladies would turn over, the closed eye didn’t have a chance to catch up to the increased brightness of the phone screen, hence having a dimmed view.
If one uses both eyes to look at the screen, this phenomenon does not happen.
Smartphone Blindness Studies Are Cause For Concern
Studies surfaced a few years ago where great lengths of smartphone use can cause retinal detachment. In these cases the layer of the retina which focuses images, detaches from the back of the eye, causing serious vision loss. Though there are treatments, if not treated early can cause permanent blindness in the affected eye since the retina loses its blood and oxygen supply when detached. A woman from China had been using her smartphone for 2-3 hours in the dark each night when this occurred.
Smartphones have also been linked to myopia, nearsightedness and sleeping disorders as the blue light emitted from the screen can disrupt melatonin production.
A recent study found that 30% of adults spend more than 9 hours a day using their smartphone. Physicians recommend avoiding extended use, adjust settings to black text on white background, and with this recent case study, use both eyes to look at the screen when using the phone at night.
Increasing the size of the font helps your eyes since they don’t need to strain as much to read. Try to look at your smartphone with a distance of 1 1/2 feet. Blinking often helps rest the eyes as well and keeps them lubricated and moist.
Additionally, avoid using the phone in the dark, but in a lit room.
Finally, its good to use the 20,20,20 rule. After every 20 minutes of use, look away at something 20 feet away for 20 seconds. This may help avoid eyestrain from excessive smartphone use.