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How to measure pupillary distance (pd measurement)

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How to measure pupillary distance (pd measurement)

What is a pupillary distance? Pupillary distance is the distance in millimeters between the centre of one pupil to the centre of the other.  It is usually around 62mm but can vary between 54mm and 74mm in adults.   Why is it necessary? The pd is necessary to ensure that your are looking out through the optical centre of the lens.  After your eye exam its a good idea to ask your optician to measure your pd and to write the measurement on your prescription.  How do i measure my pupillary distance? The quickest and easiest way to measure your pd...

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Understanding Glasses Measurements - Blue Light Glasses

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Understanding Glasses Measurements - Blue Light Glasses

Ever wonder what the numbers on the arms of your glasses stand for?  Understanding the frame measurements are an important part in choosing a pair of glasses that fits your face and suits your facial features.  Next we'll go through each of the measurements from eye size to arm lengths.    Typically on a pair of glasses you will find three numbers or measurements printed on the inside of the arm. These numbers are measured in millimeters.       The first number is the eye size The second number is the bridge width and  The third number is the arm...

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What are bifocals? Blue Light Glasses

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What are bifocals? Blue Light Glasses

When we get to our forties the cilary muscle that controls our crystalline lens weakens which results in our lens having difficulty focusing on objects up close.  This is something that happens to everyone regardless of whether they are habitual glasses wearers but the age at which it occurs can vary.  Its results in a person having two different prescriptions, one for distance (which could be zero prescription power) and one for reading.  One option is to get one pair of glasses for distance and one pair for reading. The problem with this option is that whilst the reading glasses...

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How to clean your lenses - Blue light glasses

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How to clean your lenses - Blue light glasses

Looking after your lenses is very important and often neglected job as a glasses wearer.  Its important to prevent glare as light with reflect of the scratches causing glare and can be particularly troublesome whilst driving from oncoming headlights.  It can also be a nuisance when using a computer screen as the light from the computer screen will cause glare when reflecting off the scratch.  The location of the scratch will have a big impact as to whether you notice any visual disturbances as a very central scratch will obviously be much more noticeable that one in the periphery.  Apart...

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Polarised Lenses - Are they worth it - Blue light glasses

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Polarised Lenses - Are they worth it - Blue light glasses The big advantages of polarised lenses over tinted lenses is that the polarised lenses block UV and glare from all angles.  This is most noticeable to the user in activities such as fishing and skiing where the suns rays bounce off the water and snow and hit the eye at different angles.  It is also useful for drivers where the sun for example might bounce off a puddle of water in the road.  Fishermen and anglers find them extremely useful as they can see much further through the water...

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