Understanding Your Glasses Prescription is Easier than You May Think
An add value is normally only provided on a prescription for eyeglass wearers above 40. It is around this age that presbyopia develops—a condition that results in blurred near vision even in people with nearsightedness.
The add value is used to indicate the magnifying power that will be applied to the bottom portion of a multifocal lens.
Online prescription eyewear merchant GlassesElite notes that understanding an eyeglass prescription is critical to making sure you get the right lenses when you order prescription glasses online. It gives you a clear picture of what to expect with your order and helps make communicating problems easier if you find anything wrong with the provided lenses.
http://www.glasseselite.com/blog/understanding-your-glasses-prescription-is-easier-than-you-may-think/
The add value is used to indicate the magnifying power that will be applied to the bottom portion of a multifocal lens.
Online prescription eyewear merchant GlassesElite notes that understanding an eyeglass prescription is critical to making sure you get the right lenses when you order prescription glasses online. It gives you a clear picture of what to expect with your order and helps make communicating problems easier if you find anything wrong with the provided lenses.
http://www.glasseselite.com/blog/understanding-your-glasses-prescription-is-easier-than-you-may-think/
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