If you want to buy cheap spectacles online then you need to acknowledge 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 buy your specs wisely and it they will be perfectly safe for you to utilise as long as you become cognizant of a few simple rules

Make sure that they fit you properly

If your current specs fit fine, then just measure them up properly and you will receive perfect fitting new glasses online.

You need to know four measures:

total width – A the Lens Height – b the lens Breadth – C The Nose/Bridge Width – D

Of these the most important measurement is the total width (A). To ensure that your new on line glasses 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 exact lens prescription

There are merely 4 parameters of your eye prescription that you will need to note:

1. Sphere – This refers to how short or long sighted you are. This value specifies the optical power of a lens in diopters. It invariably has a plus (+) or a minus (-) sign 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. It will be a number between 1 and 180.
3. Cylinder – Astigmatism is measured using this value. 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 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.

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