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So What IS 20/20 Vision?


It's safe to assume that you've stumbled upon the expressions visual acuity and 20/20 vision. As frequently used as these terms are, do most people actually know their meaning?

The term 20/20 indicates the clarity and sharpness of eyesight from 20 feet away. When you have 20/20 eyesight, that basically means that from a distance of twenty feet you can see that which should be seen from that distance. You may not know this, but 20/20 vision is really just a standard measurement. Many people have eyesight better than 20/20; for example, some people have 20/15 vision, so what they could see at 20 feet, a person with normal vision might only be able to discriminate at 15 feet.

Each one of your eyes is examined separately. When you're asked to look at the eye chart and read out the letters, the smallest letters you can clearly read determine the visual acuity of the eye that's being tested.

However 20/20 vision doesn't always mean you have perfect vision, because, after all, it only indicates your distance vision. There are other really crucial vision skills; being able to focus on close objects, contrast sensitivity, peripheral awareness, depth perception, eye coordination and color vision - these all contribute to your overall ability to see. And actually, someone with 20/20 vision can still have unhealthy eyes. Those with damage to the nerves within their eyes from glaucoma, diabetes, high blood pressure, or numerous other diseases are still able to have 20/20 vision. This is why your eye care professional will always carry out a comprehensive eye exam, and not just a regular visual acuity test.

During your next eye exam, you'll know exactly why you're being told to read letters from the eye chart, and more!


Personal Message from Drs. McRoberts, Bowden & Davidson regarding COVID-19

Considering the evolving situation of COVID-19, we feel it is our responsibility to prioritize the health of our community members during this critical time and do what we can to minimize the opportunity for transmission. As a result, we have made the decision to close our physical clinic and provide only virtual appointments & emergency referrals until further notice.

For Squamish patients, please call 604-892-5055 during our regular business hours to consult.
For West Vancouver patients, please call 604-922- 0413 during our regular business hours to consult.

We are here if you need us!

**Please note – we will continue to be available for your glasses, contacts, eye drops, ocular supplements and any other product or prescription needs. Please call and we can arrange to have these shipped directly to your door at no charge.

Thank you for your support and understanding as we navigate these unprecedented times. We are hopeful that this will be a temporary measure, and will be monitoring the situation carefully. Please take care of yourselves & each other, and we hope to see you soon!

Drs. McRoberts, Bowden & Davidson