05.16.09
Buying Glasses over the Internet
If you want to purchase discount eyeglasses online then you have to appreciate a few sensible steps before you get going. You can save a HUGE amount of money if you acknowledge how to purchase your specs wisely and it they will be perfectly risk-free for you to utilize as long as you become mindful of a few simple rules
Make sure that they fit you properly
If your current specs fit ok, then all you need to do is to measure them accurately and you will need to acquire perfect fitting new specs online.
You need to acknowledge a few measures:
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Make sure that you measure the total width (A) properly. You can get your new on line specs to fit perfectly well as long as you have the total width, even if you get the lens height or width slightly wrong.
Ensure that you have the correct lens prescription
There are merely a few parameters of your prescription that you will need to make a note of:
- Sphere - This is the measure of severity of you near or far sightedness. It is a measure of your lens optical power and is measured in diopters. It always has a addition (+) or a minus (-) sign in front or above it.
- Axis - you will only get this if there is actually a value for the cylinder. It really is to do with the point that indicates the dirction in which the power of your cylindrical lens. It relates to a factor between 1 and 180.
- Cylinder - Astigmatism is measured using this value. Again, there is invariably a plus (+) or minus (-) sign around. You could find that your prescription does not have a cylinder value, if you don’t have an astigmatism.
- Pupillary Distance (PD) - This is a really important factor of your prescription which helps to centre the lenses to your face. The interpupillary distance refers to the PD. It is fairly easy to measure.
