If you've never worn glasses before — or you've only ever needed one simple prescription — the words "single vision" and "progressive" on a lens order form can be confusing. Here's a straightforward breakdown of what each one actually does, and how to tell which one your eyes need.
What Single Vision Lenses Do
A single vision lens has one consistent prescription power across the entire lens. Whether you're looking through the top, middle, or bottom of the lens, the correction stays the same. This is the simplest, most common lens type, and it's what most people wear for their first pair of glasses.
Single vision lenses correct one type of vision problem at a time:
- Nearsightedness (myopia) — difficulty seeing far away
- Farsightedness (hyperopia) — difficulty seeing up close
- Astigmatism — blurred or distorted vision at any distance, caused by an irregularly shaped cornea
If your eye doctor's exam shows you only need correction for one of these, and one consistent strength across your whole field of vision, single vision is what you need.
What Progressive Lenses Do
Progressive lenses correct more than one vision problem within a single lens, with the prescription strength gradually changing from top to bottom. The top portion of the lens is typically set for distance vision, the middle transitions gradually, and the bottom is set for close-up vision — all blended together with no visible line dividing the zones (unlike old-style bifocals, which have a distinct line).
Progressives are designed for people who need help seeing clearly at multiple distances — most commonly, people experiencing presbyopia.
What Is Presbyopia, and Why Does Age Matter?
Presbyopia is the natural, gradual loss of your eye's ability to focus up close, caused by the lens inside your eye becoming less flexible over time. It's not a disease — it happens to nearly everyone eventually, regardless of whether you've had perfect vision your whole life.
Most people start noticing presbyopia symptoms in their early-to-mid 40s, though the exact age varies. Common signs include:
- Holding books, phones, or menus farther away to read them clearly
- Needing brighter light to read comfortably
- Eye strain or headaches after close-up work
- Difficulty shifting focus quickly between near and far objects (like looking from a computer screen to across the room)
If you're over 40 and noticing these symptoms in addition to an existing distance prescription, progressives let you correct both distance and near vision in one pair of glasses, instead of switching between two separate pairs.
Single Vision vs. Progressive: A Direct Comparison
| Single Vision | Progressive | |
|---|---|---|
| Corrects | One vision zone (near OR far OR astigmatism) | Multiple zones (near, intermediate, and far) in one lens |
| Best for | Most people under 40, or anyone needing only one type of correction | People 40+ typically experiencing presbyopia alongside an existing prescription |
| Visible lines on lens | No | No (unlike old bifocals/trifocals) |
| Adjustment period | Minimal to none | Often 1–2 weeks as your eyes and brain adjust to the gradient |
| Measurement precision needed | Standard PD | Often requires more precise fitting, including frame height and sometimes dual PD |
Do You Actually Need Progressives? Signs to Watch For
You likely need progressives (or should ask your eye doctor about them) if:
- You're 40 or older and have started needing reading glasses on top of an existing distance prescription
- You find yourself removing your glasses to read, then putting them back on to see distance
- Your eye doctor's prescription includes an "ADD" power (this indicates additional magnification needed for near vision on top of your base prescription)
You likely only need single vision if:
- You're under 40 with no presbyopia symptoms
- Your prescription doesn't include an ADD power
- You need correction for only distance, only near vision, or astigmatism alone
The Adjustment Period — What to Expect
If this is your first pair of progressives, it's normal to need a short adjustment period — typically 1–2 weeks — as your eyes and brain learn to use the different zones of the lens naturally. Some people notice mild peripheral distortion at first, especially when looking side-to-side rather than moving their head. This typically resolves as you adjust, but if discomfort persists beyond a couple of weeks, it's worth having your fit rechecked, since progressive lenses are more sensitive to precise frame and pupil alignment than single vision lenses.
Still Not Sure Which You Need?
The only way to know for certain is through a comprehensive eye exam — this article is educational, not a substitute for your optometrist's exam and prescription. If your written prescription includes an ADD power, that's a clear signal your doctor has already determined you need multifocal correction. If you're unsure what's listed on your prescription, our team can help you read it — reach out to hello@aldermiller.com before you order.
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