Do e-readers cause eye strain?

Photo by Librarian by Day

The NY Times Bits Blog has a great post about eye strain and new e-readers like the Kindle, Nook, iPad and others.

“Most of what our mothers told us about our eyes was wrong,” said Dr. Travis Meredith, chair of the ophthalmology department at the University of North Carolina, Chapel Hill. “Sitting close to a television, or computer screen, isn’t bad for our eyes. It’s a variety of other factors that can cause physical fatigue.”

For example, the ergonomics of reading screens and the lack of blinking when we stare at them play a big role in eye fatigue. “The current problem with reading on screens is that we need to adjust our bodies to our computer screens, rather than the screens adjusting to us,” Dr. Meredith said.”

Which e-reader offers the best reading experience?  It depends on where you’re doing most of your reading.

“E Ink has a very low contrast ratio. Although it can offer an excellent reading experience in bright sunlight, the screens can become uncomfortable to use in dark settings because of the lack of contrast and backlighting on the screen.

LCD screens, meanwhile, have long struggled to offer good viewing angles for reading. Apple’s latest IPS LCD screens include extremely wide viewing angles, but the reflective glass on the screen could be a hindrance in brightly lit situations.”

The short answer is if you’re experience headaches and other eye strain symptoms, while it might be your e-reader, you might want to consider scheduling an appointment with your eye care professional.


Seeing Green in the Optical Industry

I am often asked if glasses can be made from recycled materials. Unfortunately they currently can not be entirely made from recycled materials. In order to produce good optical qualities you need to have very pure materials whether plastic or glass to make the lenses. I talked to one of our favorite lens companies, Hoya about what they do that helps to conserve energy, resources and preserve the environment. Their parent company is in Japan where most of their plastic lenses are made. I’ve been told that the Japanese factories meet rigorous local environmental standards. The facilities here in Canada use equipment that meets similar standards. Hoya’s lenses polishing machines reuse the polish solution as well as the water that runs through them. The anti-reflective coating lab also reuses the coating materials to minimize waste.

Frames that hold the lenses face similar issues. Materials that go into making frames vary from metals like nickel, steel, stainless steel, titanium, gold and platinum to plastics and acrylics. Some plastics even have thermal memory properties. All of these products need to have very pure ingredients that go into making them in order for the frames to have the desired properties of strength, durability and flexibility. Some of these raw ingredients are recycled and refined but tracing and certifying the “greenness” is difficult.

The manufacturing of contact lenses face the same issues as lenses and frames. We tend to forget but contact lenses are medical devices, biocompatibility and ocular health need to be the first priority. I’ve had patients express concern about disposable contact lenses and the waste packaging. Yes, there is more packaging that gets tossed in the garbage but they are much healthier for the eye than conventional lenses. There is less risk of infection and inflammatory responses with disposable contact lenses. We feel that the health benefits far out way the environmental impact of the packaging.

Our suppliers and ourselves, try to do day-to-day activities that can make a difference from recycling, turning lights off and using recycled paper products and email communications. We try to minimize shipping as much as possible and ship items together whenever possible. This past year we have started to do the City of Toronto organics green bin at our office, it is amazing how much less garbage goes out these days.

The best way to make an environmental impact with your glasses is to donate your old glasses to third world programs. At our office we collect glasses for various programs. You can drop off any old glasses at your convenience.


Doctor in the House

Dr. Heeney appeared on the February 15, 2008 episode of Doctor in the House on Slice. The 4 minute segment talks about choosing sunglasses for UV protection.

“Our moms talk about the downside of “mommy brain”. Medical Researcher Carole Watson explains what mommy brain is and why it’s actually a good thing, and Optometrist Kristin Heeney shows us how to find the perfect pair of sunglasses. Plus we’ve got Q&A with Dr. Dave.” – Episode 1030 Doctor in the House

Let us know if you have questions about U/V coatings for your glasses and sunglasses or if you need to book an appointment to discuss your options.

Additional resources about UV protection for your eyes


Do you have dry eyes?

A recent study at Brigham and Women’s Hostipal in Boston found that the amount, type and ratio of essential fatty acids in the diet may play a key role in dry eye prevention in women. The study had 3 specific findings:

  • Women with the highest levels of omega-3 fatty acids in their diet had a 20 per cent lower risk of developing dry eye syndrome than women with lower omega-3 consumption
  • One of the most important factors in reducing the risk of dry eye was the ratio of omega-6 to omega-3 fatty acids in the diet. Women with a dietary ratio of omega-6 to omega-3 greater than 15:1 had 2.5 times the risk of developing dry eye syndrome compared to women with a ratio of less than 4:1
  • Tuna consumption reduced the risk of dry eye syndrome. Specifically, women who reported eating at least five servings of tuna per week had a 68 percent reduced risk of dry eye syndrome compared to those who consumed just one serving.

If you think you might have dry eye syndrome or just have questions about your vision, make an appointment to talk to us about your eye health.