If you want to purchase 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 recognise how to buy your spectacles sensibly and it they will be perfectly risk-free for you to utilise as long as you become aware of a few simple rules

Make certain that your new spectacles will fit well

If your current eyeglasses fit right, then just measure them up properly and you will need to acquire perfect fitting new specs online.

You need to acknowledge four measures:

total width – “A” lens Height – “B” the Lens width – C the nose/bridge width – D

Make sure that you measure the total width (A) properly. To ensure that your new on line eyeglasses are a good fit for your face, you only really need your total width. Don’t worry too much if you haven’t got your lens dimensions.

Ensure that you have the right lens prescription

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

1. Sphere – The amount of long or short sightedness. This value specifies the optical power of a lens in diopters. It invariably will have a addition (+) or a subtraction (-) sign in front or above it.
2. 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 will be a number between 1 and 180.
3. Cylinder – Astigmatism is measured using this value. Once Again, there is always a plus (+) or minus (-) sign present. You could find that your prescription does not have a cylinder value, if you don’t have an astigmatism.
4. Pupillary Distance (PD) – This measurement is used to accurately center the lenses in the frame that you have selected. Technically, PD is the measurement of the distance between the centre of your pupils.