Even though there is no proof blue light is blinding this generation yet, we are not sure its cumulative effect will not be noted until years from now when this generation’s rates of macular degeneration has increased.
What I hypothesize, although it will take years to prove, decreased blink rates when one looks at any electronic screen (this is a general fact, especially if one does not have a blinking app installed) decreases oil out of the meibomian glands which leads to scar tissue on the surface of the cornea which can lead to loss of vision requiring a corneal transplant in a small % of patients and even children currently. My fear this % is growing yearly.
Rarely to I advocate state intervention in medical issues, but on this one it would make sense for researchers and the government to assign 1 school district in NYC or DC to be a “no/minimal smartphone, electronic screen” school: meaning the students only use textbooks & are encouraged to ditch their tv & only use screens for “eye worthy” things. Another school district stays the way it is with books on screens, kids use their smartphones for sometimes 8-10hrs a day which is becoming a norm in DC. And let’s follow these kids yearly for the next 10-20 years.
Alternatively which Dr. Dimitri Azar jokingly suggested to me last week: patch 1 eye of each child who uses screens a lot to see what happens. Obviously for any eye surgeon this is a joke as this would be malpractice as it would lead to a deep amblyopia (ie lazy eye) in that patched eye. But Dr. Azar raises an important point, proving the damaging effects of smart phones is hard without controls. It has taken us 6months to find 50+ controls of kids who are not on electronic screens more than 2 hrs per day for our MGD study. These kids are becoming extinct and we need to act now to do a good study before it is too late.
Blue light from electronic screens is not making you blind. A recently released study has been creating both concern in the public and alarmist headlines
from news outlets worldwide. But experts are cautioning that the news reports are leaping to unfounded conclusions about the potential effects of blue light
on the eye.
This laboratory research is not a reason to stop using your screens. When asked by The Verge
whether his research showed that using electronic screens causes blindness, Ajith Karunarathne, PhD, lead author of the study, replied, “Absolutely not.”
The research comes from the University of Toledo and was published in Scientific Reports
. The researchers were looking at what happens when a specific chemical, retinal, is exposed to blue light. Retinal is present in the eye. And blue light enters the eye, both naturally in sunlight and from electronic screens. But the study’s findings cannot be turned into recommendations for real people in the real world.
Janet R. Sparrow, PhD, who is the Anthony Donn professor of ophthalmic sciences and professor of pathology and cell biology at Columbia University in New York, offered several notes of caution about this study:
- The experiments do not mimic what happens in live eyes.
- The cells that were tested are not derived from retina cells.
- Cells in the study were not exposed to light in the way cells in the eye are naturally exposed to light.
- The part of the cells that was affected by retinal in the experiments (the cell membrane) does not touch retinal in the eyes of living people.
- Retinal is toxic to some cells whether or not it’s exposed to blue light. Live retina cells have proteins that can protect them from these possibly toxic effects.
- Other cells that were also exposed to retinal and blue light by the investigators would not be exposed to blue light in the body. Blue light only reaches the skin and the eyes. It cannot have any effect deeper in the body.
In other words, the researchers took cells that are not from the eye, put them together with retinal in a way that doesn’t happen in the body and exposed the cells to light in a way that doesn’t happen in nature.
Real Concerns About Screen Use and Eye Safety
If you have questions or concerns about your eye health, you should talk to your own ophthalmologist. Your doctor can make recommendations that are right for you and your lifestyle.
Spending too much time looking at a screen
can keep people from blinking as often as they should and from focusing on things at different locations. This can make the eyes feel dry, gritty, tired or strained. The simple solution is to look at least 20 feet away, for 20 seconds, every 20 minutes. Ophthalmologists call this the ‘20-20-20’ rule.
Originally published Aug. 15, 2018. Updated Aug. 20 to include comment from Dr. Karunarathne.