An example of an eyeglass prescription
Confused? Let's use an example to clear things up. (Yes, pun intended.) Here is a sample eyeglass prescription:
OD -2.00 SPH +2.00 add 0.5 P.D. BD
OS -1.00 -0.50 x 180 +2.00 add 0.5 P.D. BU
In this case, the eye doctor has prescribed -2.00 D sphere for the correction of myopia in the right eye (OD). There is no astigmatism correction for this eye, so no cylinder power or axis is noted.
This doctor has elected to add "SPH," to confirm the right eye is being prescribed only spherical power. (Some doctors will add "DS" for "diopters sphere;" others will leave this area blank.)
The left eye (OS) is being prescribed -1.00 D sphere for myopia and -0.50 D cylinder for the correction of astigmatism. The cyl power has its axis at the 180 meridians, meaning the horizontal (180-degree) meridian of the eye has no added power for astigmatism and the vertical (90-degree) meridian gets the added -0.50 D.
Both eyes are being prescribed an "add power" of +2.00 D for the correction of presbyopia.
This eyeglass prescription also includes prismatic correction of 0.5 prism diopter in each eye. In the right eye, the prism is base down (BD); in the left eye, it's base up (BU).
An eyeglass prescription cannot be used to buy contact lenses
Eyeglass and contact lens eyeglass prescriptions aren't the same. An eyeglass prescription is for the purchase of eyeglasses only. It does not contain certain information that is crucial to a contact lens eyeglass prescription and that can be obtained only during a contact lens consultation and fitting.
Eyeglass lenses are positioned at a distance from the eyes, while contacts rest directly on the eyes. That distance affects the lens power required for eyes to focus properly.
In addition to the information in an eyeglass prescription, a contact lens eyeglass prescription must specify the base (central) curve of the back surface of the contact lens, the lens diameter, and the specific manufacturer and brand name of the lens.
Also, the power of an eyeglass prescription frequently is modified when determining the best contact lens power. This is because eyeglass lenses are worn some distance (usually about 12 millimeters) from the surface of the eye, whereas contact lenses rest directly on the corner of the eye.
An accurate contact lens eyeglass prescription can be written only after a contact lens fitting has been performed and the prescribing doctor has evaluated your eyes' response to the lenses and to contact lens wear in general.
Your eyeglass prescription: It's yours to keep
The Federal Trade Commission (FTC) is the U.S. government's consumer
protection agency. In 1980, the FTC's Eyeglass Prescription Release Rule became law. This rule requires eye doctors to give patients a copy of their eyeglass prescription at the end of an eye exam that includes a
refraction The Eyeglass Prescription Release Rule is intended to allow the "portability" of your eyeglass prescription so you can buy glasses from the vendor of your choice.
Your eye doctor must give you a copy of the eyeglass prescription whether or not you ask for it. Eye doctors may not condition the release of your eyeglass prescription on your agreement to purchase eyeglasses from them, nor may they charge you an extra fee to release your eyeglass prescription.
They also may not disclaim liability for the accuracy of the eyeglass prescription if you purchase eyeglasses elsewhere.
Eye doctors who violate the provisions of the Eyeglass Prescription Release Rule are subject to a civil penalty of $10,000 per violation.
How (And Where) To Buy Eyeglass Prescription Glasses Online
Ever heard of a brand called Warby Parker? Us too. They broke the eyeglass industry a few years back by offering eyewear at unprecedentedly low prices, online only. Since then, several other companies have followed in their footsteps.
To help you navigate what the online eyewear market looks like now, we've rounded up just how and where to buy eyeglass prescription glasses online.
Get Your Eyeglass prescription
Sorry for this step you'll have to interact face to face with other humans. Visit a local optometrist and go through the process of updating your eye eyeglass prescription. Make sure you find out your pupillary distance (PD), the horizontal distance across your face between your two pupils.
It's possible to figure out your PD yourself using online resources, but it's always easier to just hand that task over to the experts. Where To Find Glasses Online
You can browse an infinite variety of eyeglasses on an infinite number of websites these days —there's no lack of options in this arena. And while it's convenient to have the product delivered directly to your doorstep, picking out the perfect pair can be daunting.
Many eyewear sites will guide you through this process, offering tutorials on exactly how to pick out the perfect frames for you, including what frames fit your face shape best, and how to utilize your insurance and send in your eyeglass prescription.
After all, these frames are an important purchase — they'll soon become a part of your daily life. But overall, don't sweat it: Brands are constantly getting smarter and offering more educational tools to help you make the right decision.
Check The Return Policy
This may seem like a no brainer, but sometimes it's easy to forget. Checking the return policy is crucial because a piece of eyewear is such a personal purchase. They're on your face, they're how you see the world. Luckily, most sites are sympathetic to this and have generous return policies.
There are so many reasons to love Warby Parker. For starters, its site offers educational tools on how to choose the right lenses for you, which include a short quiz on how to pick your frames and take your insurance, personal budget, PD and eyeglass prescription into account.
Warby Parker's home try-on kit allows you to pick five frames to try for five days, then return the ones you don't want with the already provided prepaid label. The company also offers the Buy A Pair, Give A Pair program, through which it donates a pair of glasses to someone in need for every pair sold.
If you need glasses fast and hassle-free, Overnight Glasses is where you turn. The company ships your glasses in as fast as 24 hours and offers a 100 percent satisfaction guarantee with no questions asked return policy. A plethora of tools and customer reviews on the Overnight Glasses site can help you make an informed decision.
Eyeconic carries a vast array of designer frames for you to choose from. Through its site, you can connect to a doctor to obtain an eyeglass prescription and have your PD measured, and it's the only place that allows you to purchase frames straight through your vision insurance.
Time to Shade does all of its designing in-house to create affordable eyewear. Its site offers education on how to purchase eyewear and read an eyeglass prescription and has a variety of programs, from referrals and loyalty to affiliates and student discounts. Time to Shade also partners with two charities, Feed the Children and The Lions Club, for eyewear donations.