What Does "ADD" Mean on Your Eyeglass Prescription

Key Takeaways• ADD stands for "addition"—the extra magnifying power added to your prescription for near vision.• ADD is most common for people over 40 who develop presbyopia, the natural age-related loss of near focus.• ADD values usually range from +0.75 to +3.00 and are used in reading glasses, bifocals, and progressive lenses.

You pick up your eyeglass prescription and there it is: a line labeled "ADD" with a number next to it. If you've never seen it before, it can be confusing. Is it important? Do you need it?

For many people, ADD is one of the most useful numbers on the prescription. It's the key to comfortable reading, clear screens, and smooth near vision. Here's everything you need to know about what ADD means, who needs it, and how to read it.

What Does ADD Mean in an Eye Prescription?

ADD stands for addition. It refers to the extra magnifying power added to your distance prescription to help you see clearly at near distances—like reading a book, using your phone, or working at a computer.

It's not a replacement for your regular prescription. Instead, it's a boost layered on top of it. That's why it's called an "addition": it adds near-vision support to your existing distance correction.

Typical ADD values:

• Usually between +0.75 and +3.00
• Most often the same for both eyes
• Commonly prescribed for reading glasses, bifocals, and progressive lenses

Who Needs an ADD?

ADD is most commonly associated with presbyopia—the natural, age-related loss of near vision that usually becomes noticeable around age 40. As the lens of the eye becomes less flexible, focusing on close objects gets harder, and symptoms like these start to appear:

• Holding books or phones farther away to read them
• Blurry near vision, especially in dim light
• Eye strain after long periods of reading or screen time

If any of that sounds familiar, an ADD can restore comfortable near vision. It's also prescribed for people who need near correction for other reasons, regardless of age.

How to Read the ADD Value

On a standard prescription, ADD appears in the same section as SPH (sphere), CYL (cylinder), and AXIS. It's almost always a positive number and may be labeled "ADD" or "NV" (near vision). If your eyes need different amounts, you'll see separate values for OD (right eye) and OS (left eye).

One important thing to know: ADD is not a fixed number for life. It can change as your vision changes, which is why a current eye exam is essential before ordering new reading or progressive glasses.

What Kind of Glasses Use the ADD Value?

Reading Glasses

Single-vision lenses built around the ADD value for reading and close-up tasks.

Bifocals

Two distinct zones: the top for distance and the bottom for near, separated by a visible line.

Progressive Lenses

No visible line—the power increases gradually from distance to near, covering every range in between.

Office and Computer Lenses

Designed for intermediate and near ranges, ideal for long hours at a desk or on digital screens.

FAQ

Is the ADD value the same as reading power?

Not quite. ADD is the extra power that supports near vision on top of your distance prescription. Reading glasses are built using this addition, but the two aren't interchangeable terms.

Can the ADD be different for each eye?

In most cases both eyes have the same ADD, but not always. If your near-vision needs differ between eyes, your eye doctor will list separate ADD values for OD and OS.

Can ADD be added to sunglasses?

Yes. If you need near-vision correction, ADD can be included in your sunglasses prescription. It's most common in reading and multifocal lenses, but it's possible.

I'm under 40—do I need an ADD?

Probably not, since ADD is usually tied to presbyopia, which comes with age. But if you struggle with near vision for other reasons, your eye doctor may include an ADD in your prescription.

Conclusion

Understanding ADD isn't just about knowing a number—it's about understanding how your eyes focus and what kind of lenses will keep you comfortable. Whether you need reading glasses, bifocals, or progressives, a current prescription with the right ADD makes all the difference.

At BQEYE, we're here to help you find eyewear that fits your vision and your style. If you have questions about your prescription or choosing the right glasses, our customer care team is ready to help.