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If you want to get hold of discount glasses online then you have to appreciate a few sensible steps before you get going. It is true that you are now uniquely able to dramatically reduce how much you have to spend if you know how to purchase your eyeglasses wisely and it they will be perfectly unhazardous for you to use so long as you become heedful of a few simple rules

Make certain that your new spectacles will fit well

If your current spectacles fit ok, then just measure them up properly and you must acquire perfectly fitting new eyeglasses online.

You need to recognise 4 measures:

the total width – “A” the Lens height – B the Lens width – “C” Nose/bridge Breadth – D

Of these the most important measurement is the total width (A). You can get your new on line spectacles 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 right lens prescription

There are four parameters of your prescription that you will need to note:

1. Sphere – The amount of long or short sightedness. It is a measure of your lens optical power and is measured in diopters. It invariably has a positive (+) or a minus (-) sign in front or above it.
2. Axis – this relates to the reference point which denotes the direction of the power of your lens. It only really applies if you have cylindrical lens though.. The value will be a number between 1 and 180.
3. Cylinder – This refers to the degree of astigmatism that you possess. 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 is a really important factor of your prescription which helps to centre the lenses to your face. PD is the distance from the center of the pupil (black circle) in one eye to the center of the pupil in the other eye.