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The polarized filter is made of molecules that naturally line parallel to each other and, when applied consistently to a lens, creates a microscopic filter than absorbs any light matching their alignment. Most of the annoying glares that make us want to wear polarized lenses occur from horizontal surfaces, thus the polarized filter applied to lenses are aligned vertically to block horizontally polarized light and to allow vertically polarized light to pass through in turn reducing the amount of glare that comes from horizontally polarized light.
Keeping your glasses clean will help prevent scratches to your lens and ensure the sharpest vision possible for your lenses.
Over the past decade, digital media has become more and more prevalent. Digital media once dominated by only television is now supplemented with computers, laptops, tablets, smartphones, and other multimedia devices. According to the Nielsen Company Audience Report, the average adult in the United States spends roughly 11 hours each day consuming digital media. That’s a lot of screen time! Considering that the average person is awake for only 16-18 hours, we are spending ~65% of our awake time in front of a screen.
These countless hours spent on reading from a screen can be potentially harmful to our eyes. Many of us have probably been exposed to these symptoms one point in time - dry eyes, blurred vision, and eye fatigue. These factors have been dubbed computer vision syndrome.
Glasses prescriptions ensure that your lenses are made specifically tailored to your eyes. Prescriptions are usually written in a chart format comprised of two rows and five columns. The two rows represent each eye (right and left), while the five columns represent different features that describe your prescription.
The first thing you will see on your prescription are the areas labeled OD and OS. OD stands for oculus dexter, but simply put, OD refers to your right eye. OS stands for oculus sinester or your left eye. Sometimes these terms are replaced with R and L – right and left.
The first thing you will see on your prescription are the areas labeled OD and OS. OD stands for oculus dexter, but simply put, OD refers to your right eye. OS stands for oculus sinester or your left eye. Sometimes these terms are replaced with R and L – right and left.
The PD is a crucial number when purchasing prescription glasses. PD or Pupillary distance refers to the distance between the center of each pupil and helps correctly position the lenses to ensure proper vision. The PD number is sometimes included in your prescription but may often be omitted by your eye care professional.
You can measure your PD by yourself or with the help of a friend.
While holding a ruler with the mm side facing up, place one end directly below the center of your eye. Align the ruler horizontally to the center of the opposing eye and measure the distance between the two eyes. It is important that you are looking straight forward when measuring for the most accurate number.