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If you want to purchase discount specs online then you have to appreciate a few sensible steps before you get going. You can save a HUGE amount of money if you know how to buy your spectacles wisely and it they will be perfectly good for you to utilize as long as you become mindful of a few simple rules

Ensure that you have the right fit

If your current specs fit ok, then just measure them up properly and you must get perfectly fitting new glasses online.

You need to recognise 4 measurements:

total width – “A” The lens height – b the Lens Width – c Nose/bridge Width – “D”

Of these the most important measurement is the total width (A). You can get your new internet eyeglasses to fit perfectly well so long as you have the total width, even if you get the lens height or width slightly wrong.

Ensure that you have the right lens prescription

There are a few parameters of your eye prescription that you will need to note:

1. 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 will have a plus (+) or a subtraction (-) symbol in front or above it.
2. Axis – This will only appear if there is a value for cylinder, as it relates to the cylindrical lens and denotes a reference point that indicates the direction of the power of the cylindrical lens. The value will be a number between 1 and 180.
3. Cylinder – This is the measure for astigmatism. Once More, there is always a plus (+) or minus (-) sign present. You don’t always have this value denoted in a lens prescription.
4. Pupillary Distance (PD) – This part of your prescription helps to centre the lens within your frame on your face. The interpupillary distance refers to the PD. It is fairly easy to measure.