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If you want to purchase prescription glasses on line then you need to know a few things first. It is true that you are now uniquely able to dramatically reduce how much you have to spend as long as you acknowledge how to purchase your spectacles wisely and it they will be perfectly sound for you to utilise as long as you become heedful of a few simple rules

Make sure that they fit you properly

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

You need to know a few measures:

total width - “A” the Lens Height - B Lens width - c The Nose/bridge width - d

A - total width - is the most important thing to measure accurately. To ensure that your new on-line spectacles 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 proper lens prescription

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

1. Sphere - This is the measure of severity of you near or far sightedness. The number deals with the strength of your lens. It usually will have a addition (+) or a negative (-) symbol 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 - This refers to the degree of astigmatism that you possess. Once Again, there is always a plus (+) or minus (-) sign present. There may not be a value of cylinder in your prescription.
4. Pupillary Distance (PD) - This measurement is used to accurately center the lenses in the frame that you have selected. 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.