Buying Spectacles On-line
If you want to get hold of discount glasses on line then make sure you understand one or two essentials before you start. You can save a HUGE amount of money as long as you know how to purchase your eyeglasses sensibly and it they will be perfectly good for you to utilize so long as you become mindful of a few simple rules
Ensure that you have the proper fit
If your current specs fit OK, then take your time in measuring your old glasses and you must have perfect fitting new specs online.
You need to know 4 measurings:
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A - total width - is the most important thing to measure accurately. You can get your new internet glasses to fit perfectly well as long as long as you have the total width, even if you get the lens height or width slightly wrong.
Ensure that you have the accurate lens prescription
There are a few parameters of your prescription that you will need to glean:
- 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 usually will have a plus (+) or a minus (-) symbol in front or above it.
- 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 relates to a factor between 1 and 180.
- Cylinder - This refers to the degree of astigmatism that you possess. Once More, there is invariably a plus (+) or minus (-) sign around. You don’t always have this value denoted in a lens prescription.
- 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.
