Understanding your prescription

A prescription can be written in various ways, but the basic components remains universally the same. The various prescription components are:

• RE - right eye
• OD - ocular dexter
• LE - left eye
• OS - ocular sinister
• PD - pupillary distance or distance between your pupils.
• Sphere - The first part of your prescription. It must always have a + or a - sign.
• Cylinder always written with an Axis direction and must have a + or - sign.
• Add - if you need a separate magnification to see things close, for example to read, then you may find an 'ADD' prescribed.
• Near Add - same as 'ADD'
• Inter add - reduction in near 'ADD' to accommodate an intermediate distance, usually within 55-75cms.
• Prism - for muscle imbalances a prism might be prescribed.

At specsonweb, all you need to do, is to upload the photo of your prescription and select the appropriate lens package. We will match the prescription to your request and requirements.

Pupillary Distance (PD)

This is simply the 'distance between your pupils'. Your prescription may or may not have this measurements.

• If you have this measurement and was professionally taken, please enter it in the order section.
• If you do not have your PD measurement, simply choose, I do not know my PD. We will take this measurement remotely and will send you a link that will explain how this is taken. This service is provided by What-Specs.com and every Specsonweb (SOW) customer who has purchased glasses from us but does not have this measurement, we will get this measured at no extra fee.