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SUNRAY GUIDES · CHOOSING YOUR GLASSES
Single-Vision, Bifocal and Progressive Lenses: How to Choose
Single-vision lenses provide one focal correction; bifocals provide two distinct zones; progressives blend through changing powers without a dividing line. Choosing between them starts with your main tasks, working distances and individual correction—not the number of features. A pair suited to sustained reading may serve a different purpose from glasses for frequent task changes. AAO EyeWiki explains these lens categories.
Single vision, bifocal and progressive: what changes?
Single vision describes a lens without a separate near addition zone. It can be prescribed for distance, near or a particular intermediate task. Single-vision reading glasses are the near-use example, not the whole category.
A traditional distance-and-near bifocal combines an upper distance portion with a lower reading segment, usually marked by a visible line. It does not include a dedicated intermediate corridor. A common everyday prescription progressive blends from distance through intermediate to near powers. Ohio State Wexner Medical Center describes this distinction.
These names describe optical design. Whether the glasses are individually prescribed or ready-made is a separate question. A preset progressive reader cannot be assumed to supply your distance prescription. For that distinction, see what progressive lenses and progressive readers are.
Which task pattern sounds most like your day?
Mostly one close-up task
Imagine an uninterrupted chapter, a crossword or detailed hobby work. Start by describing that task and where you hold it. A suitable single-vision reading correction is worth discussing when near work is the priority; it does not require choosing between a separate distance and reading segment.
That convenience has a boundary: a near-use pair should not be treated as your distance glasses. If you also need individual correction, the same near task may call for prescription reading glasses rather than a preset reader. The College of Optometrists explains the limitations of ready-made readers.
Regularly changing between tasks
Now imagine reading notes, checking something across the room and returning to the page. An appropriately supplied multifocal pair may reduce some switching between glasses. A traditional distance-and-near bifocal serves two areas; a common everyday progressive also offers a gradual intermediate transition. The benefit depends on the actual correction and design matching your tasks.
Write down what you switch between. “I want one pair” is a preference; “I read a menu, then look across the room” gives useful information for discussing the correction.
Long periods at a monitor
A screen is not automatically at book distance. Single-vision computer glasses can be prescribed for the measured screen distance, while a workplace bifocal can pair screen and closer reading correction. That differs from the usual distance-and-near bifocal. CCOHS explains these task-specific options and their distance limits.
Office lens designs are another discussion: they prioritise workplace viewing distances rather than assuming one everyday design suits every desk. ZEISS describes dedicated office lenses. See our guide to books, phones and computer screens for a task record.
Include fit and tradeoffs in the decision
A line-free design can be appealing, but it does not make every lens area equally clear for every distance. Progressive wearers may notice peripheral blur and need time to learn the useful viewing areas; adaptation varies. Cleveland Clinic discusses these tradeoffs.
Position also matters. Prescription progressives need accurate fitting, and misalignment can affect clarity. Ohio State explains why fitting matters. Ask about fitting and follow-up rather than using a promised adjustment deadline as your deciding factor.
Compare the full proposal: which correction is supplied, the tasks it is intended for, how the frame fits and what support is available. A higher feature count does not answer those questions.
A neutral task-based comparison
Use this table to prepare a conversation with an eye-care professional or to ask clearer product questions. The options are worth considering, not conclusions about what you personally need.
| Main pattern | Consider discussing | Verify before relying on it |
|---|---|---|
| Sustained near work | Single-vision reading correction | Your near working distance and individual correction |
| Distance and reading, with little intermediate work | Distance-and-near bifocal or separate task pairs | Both required corrections and the reading segment position |
| Frequent changes across several distances | An appropriately prescribed everyday progressive | Correction, useful viewing areas, fit and adjustment support |
| Prolonged screen work | Screen-specific single vision or a workplace design | Screen distance, closer tasks and limits outside that setup |
Where SunRay's current readers fit
SunRay Portable readers and SunRay Foldable readers are presented as single-vision reading options. Their carrying designs are separate from their optical category.
SunRay Round readers are positioned as progressive photochromic readers. This identifies a different design and a light-responsive feature; it does not establish individual distance correction, exact zone powers or working distances.
These examples help you read the product categories. This guide does not supply a bifocal product recommendation or rank a SunRay pair as universally better.
Four checks before choosing
Name the priority. Choose the task you spend most time doing, not the lens with the longest feature list. Note what you want to improve about your current routine.
Record the changes. Add the other tasks, their positions and how often you switch. Bring your existing glasses and a short description of when they work well or poorly.
Clarify individual correction. If you have a distance prescription, unequal needs between eyes or astigmatism, discuss how those requirements will be supplied. Lens design alone does not resolve them. Our reading glasses versus prescription glasses guide explains the distinction.
Check the actual pair. Confirm the strength label, intended tasks, fitting advice and support. For the separate near-strength decision, read how to choose reading glasses strength.
Common questions
Are progressive lenses always better than single vision?
No. Compare the correction and tasks you need covered. Added viewing areas bring their own fitting and use considerations; they are not a universal upgrade.
Can single-vision glasses be used for a computer?
Yes, when the correction is suitable for that working distance. Single-vision reading glasses selected for a book are not automatically screen-specific glasses. CCOHS explains the distinction.
Is a bifocal just a progressive with a visible line?
No. A traditional bifocal has distinct portions; a progressive changes power gradually through a transition. They arrange correction differently.
What should I check if I already have distance glasses?
Confirm what near help you need and how your distance correction will be supplied. Do not assume that choosing a ready-made reader strength replaces your existing prescription.
Do I have to use one lens type for everything?
No. Ask whether an everyday pair plus a dedicated task pair would suit your routine. Compare what each pair covers and where you will switch, rather than expecting one design to do every job.
