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Across from the Delta Hotel on Erb St. in Waterloo, ON

Across from the Delta Hotel on Erb St. in Waterloo, ON

Home » What's New » Blue Light Danger & Digital Devices

Blue Light Danger & Digital Devices

                                                            Blue Light Explained



For years we have known about the danger of UV light to the skin and eyes and most spectacle lenses now protect eyes from UV below 400 nm.



We now have fairly good evidence that visible blue light from 400-500 nm (particularly from screens) can be a factor in not only sleep disruption but vision loss from macular degeneration. Eventually the manufacturers of computer screens, tablets and smart phones will modify their screens to block the harmful blue/violet light while still allowing the better blue/turquoise light to reach our eyes. In the meantime, we would like to give our patients the ability to protect themselves.



                                                            Who are most at risk?



Children, young adults and anyone who has had cataract surgery are most at risk. This is because the natural lens inside our eyes (located just behind the iris) gradually yellows with age and protects us from blue light. Children and young adults have very clear lenses which let most of the blue light into the eye. Implant lenses which replace the natural lens after cataract surgery do not give protection from blue light either. Anyone who holds smart phones and tablets close to the eyes increases their risk of damage from blue light.



                                                             What can we do?



Our best recommendation is for anyone at high risk to wear filtering lenses such as Blu Tech lenses as their computer or gaming glasses as well as possibly using a stick-on screen protector  such as Ocushield. There is now even blue light reducing software such as f.lux (for the tech savvy) which can be downloaded to enable your computer to reduce it's own blue light emission.



We don't want to unnecessarily worry our patients but as all of our optometrist and staff are now wearing Blu Tech lenses to work, we want to offer all of our patients the same level of eye protection in their work and home environments.