Single Vision vs Bifocal vs Progressive Lenses: Which Is Right, and What About Screen Work?

"Single focal", "bifocal", "progressive": the words sound similar, and the differences matter once you spend your day at a screen. This guide explains each lens, the types of bifocal and which suits computer and office work. Our progressive lenses vs bifocals guide covers cost and adaptation.

Single vision (single focal)

One power across the whole lens, for one distance: far, or near. It is the simplest and the least expensive. If you only need help with distance or only with reading, this is usually what you get.

Bifocal

Two powers in one lens, with a visible line: distance above, reading below. Types:

• Round segment: a small round reading area.
• Flat-top (D-segment): a D-shaped reading area with a flat top edge.
• Executive: the reading area runs the full width of the lens, so it is the widest of the three.

There is no zone between far and near, which is the gap that makes screens awkward.

Progressive

A smooth change from distance, through intermediate, to near, with no line. The intermediate zone is what makes it suit screens. It takes a few days to adapt to, and it costs more.

What about a computer or office?

A screen sits at intermediate distance, roughly an arm's length. So:

• Single vision set for screen distance: a good option if you do not need distance and near at the same time.
• Progressive: covers distance, screen and reading in one pair.
• Office or occupational lenses: some lens brands make lenses designed for near and intermediate work. Ask us what is available for your prescription.
• Plain bifocal: has no screen zone, which is why people find it awkward at a monitor.

"DSE glasses" is the UK term for glasses made for screen work. The same ideas apply.

Side by side

	Single vision	Bifocal	Progressive
Zones	1	2, with a line	3, no line
Screen distance	If set for it	No zone	Yes
Adaptation	Easy	Quick	Takes days
Cost	Lowest	Middle	Highest

What to ask before you order

1. What distances do I need to cover each day?
2. How far is my screen from my eyes?
3. Which lens design, and what does it cost?
4. Will you measure fitting height and PD? See how to read your prescription.

Progressive and bifocal lenses have their own prices on the lens prices page, and what prescription glasses cost shows how the bill adds up. For reading-only needs, see the best reading glasses guide.

This article is general information, not medical advice. For persistent symptoms or any sudden change in your vision, see an eye-care professional.