Unrelating

If you want to get hold of cheap glasses online then you need to know a few things first. You can save a HUGE amount of money if you know how to purchase your specs sensibly and it they will be perfectly unhazardous for you to utilise as long as you become heedful of a few simple rules

Make certain that your new spectacles will fit well

If your current specs fit right, then just measure them up properly and you will need to have perfectly fitting new spectacles online.

You need to recognise four measurings:

the total width - A the Lens Height - “B” The lens Breadth - c The nose/bridge breadth - D

Of these the most important measurement is the total width (A). Providing you have go the accurate total width, it doesn’t really matter if you have not got the height or width of your lens to get your internet specs to be a good fit.

Ensure that you have the precise lens prescription

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

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 invariably has a addition (+) or a subtraction (-) 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.. 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 invariably 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.