Rx Lens



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A prescription RX is written by an eyewear prescriber, such as an optometrist or ophthalmologist, to correct your vision with a pair of eyeglasses with corrective lenses.

An Rx chart will have horizontal rows or vertical columns. The right eye will always be listed first and abbreviated as OD. The left eye will come second and abbreviated as OS.

Each row of an Rx chart has three main sections: Sphere (SPH), Cylinder (CYL), and AXIS. The SPH section corrects nearsighted or farsighted vision. The CYL and AXIS sections correct an astigmatism.

There may also be a fourth section on the Rx , NV-ADD (for Near Vision-Reading ADDition), which could be used to order a pair of bifocal or progressive glasses with a close-up vision section in the bottom part of the lens.

The SPH, CYL, and NV-ADD numbers will always have a plus or minus sign.

(You need an Rx written specifically for eyeglasses; an Rx for contact lenses will not work for eyeglasses!)

As a general rule, you should examine your eyes once a year or once every two years.
The eye doctor must give you a copy of your prescription – whether you ask for it or not! It's the law. The doctor can't require you to pay an extra fee, buy eyeglasses or contact lenses, or sign a waiver or form.

Prescriptions are typically written with an expiration of one to two years. You should get a new pair if your prescription has changed; your doctor will let you know when giving you the “Rx Chart.”

The wrong prescription may feel weird and it can even give you a headache if you wear them very long, but it won't damage your eyes. If your glasses have an old prescription, you might start to experience some eye strain. So, it is definitely good for you to have the right correction!

You could but if you notice a change in your vision and are looking for glasses as a corrective solution, it's important to see your optometrist first so you can get the correct prescription for your eyes. Without the right lenses you may experience a range of symptoms.
Most eye care professionals will tell you it will likely take two to three days to adjust to a normal change in prescription, but the adjustment period can last up to two weeks in some rare cases.

Pupillary distance (PD) is the measurement of the distance between your pupils. This is needed for the manufacturer of the eyeglasses to know where to place the optical center on each lens, so you can see well with the glasses.

Am I a single PD or dual PD?
  • A single PD it is the measurement, in millimeters, from the center of one pupil to the center of the other.
  • A dual PD is the measurement of the center of each pupil to the center of the bridge of your nose.
No, for now we are only offering single-vision Rx.

It is a common and generally treatable imperfection in the curvature of your eye that causes blurred distance and near vision.

Most of us have it, so if you have astigmatism on your Rx, we can definitely make glasses that will correct it!

If you have a glasses prescription with an NV-ADD, it is best to order Prescription Reading Glasses. If you do not have a glasses prescription and typically buy reading glasses from the drugstore, you may consider Over the Counter Reading Glasses.
Glasses with prism correction eliminate or reduce diplopia, or double vision. We do not currently offer prism correction.
No, contact lens Rx can only be used for contact lenses. You need a specific Rx written for eyeglasses.
You can simply select your favorite pair and add it to the cart without adding prescription. All of our non-Rx-able glasses have blue-light blocker.
Blue light contributes to digital eye strain; computer glasses that block blue light may increase comfort. The light from our devices is “short-wavelength-enriched,” meaning it has a higher concentration of blue light than natural light; which affects levels of the sleep-inducing hormone melatonin more than any other wavelength.