2024-07-14
The Moment It Usually Comes Up
You are at your eye exam and your optometrist says something like "I am going to add a small reading addition to your prescription." If you are between 40 and 50, this is your welcome-to-presbyopia moment. Your eyes are not broken. The lens inside your eye is just getting less flexible, and close-up focusing is getting harder. It happens to everyone.
The question is: do you need progressive lenses now, or can you get by with single vision a little longer?
What Single Vision Lenses Do
Single vision lenses correct for one distance. If you are nearsighted, they correct distance vision and you can still read up close without help (because your natural eye already focuses close). If you are farsighted, they might correct for distance, or for reading, but not both at once.
For most people under 40 with a straightforward prescription, single vision lenses are all you need. One pair, one focus distance, simple.
What Progressive Lenses Do
Progressive lenses are essentially three prescriptions blended into one lens: distance at the top, intermediate (arm's length, computer distance) in the middle, and reading at the bottom. There is no visible line between zones, which is why people prefer them over bifocals cosmetically.
The trade-off is that the blending creates areas of mild distortion on the edges of the lens, and you need to learn to move your head rather than just your eyes to use each zone effectively.
The Real Decision Point
Here is how to think about it practically:
You can probably stick with single vision if:
- Your ADD power is +1.00 or less. At this level, you might notice very slight difficulty with tiny print, but you can still read your phone and a menu in a restaurant without issues.
- You are mildly nearsighted and can read comfortably by taking your glasses off. Many nearsighted people use this trick for years before switching to progressives. It works fine as long as you do not need to see distance and close-up at the same time frequently.
- You mostly use your glasses for one activity. If you only wear glasses for driving, single vision distance lenses make sense. If you only need reading glasses, single vision readers are simpler and cheaper.
You probably need progressives if:
- Your ADD power is +1.50 or higher and you wear glasses all day. At this level, the difference between distance and near focus is significant enough that single vision cannot do both.
- You find yourself taking your glasses on and off constantly throughout the day. This is the classic sign. You need them for driving, take them off to read, put them back on to look at the TV, take them off for your phone. Progressives eliminate this dance.
- Your work involves frequent distance changes. If you look at a computer, then at papers on your desk, then across the room at a colleague, progressives make this seamless. Single vision forces you to choose which distance to optimize.
- You have tried separate distance and reading glasses and you are tired of juggling two pairs.
The In-Between Option: Office Lenses
If your main issue is computer work and reading but you do not need distance correction (or barely do), there is a middle ground. Occupational lenses (sometimes called office lenses or computer progressives) are designed specifically for the range from your desk to about 3 metres away. They give you a wider intermediate and reading zone than regular progressives, but they are not for driving or walking around.
These are genuinely useful if you spend most of your workday at a computer and currently wear progressives that feel too narrow in the middle zone. The trade-off is you need a separate pair for driving and general distance use.
Common Misconceptions
"Progressives will make my eyes worse"
No. Progressives correct for what your eyes already cannot do. Wearing them does not accelerate presbyopia. Not wearing them does not slow it down. Your ADD power will increase gradually over the next 10 to 15 years regardless of what lenses you wear.
"I should wait as long as possible before starting progressives"
Actually, the opposite is true. People who start progressives with a low ADD power (+1.00 to +1.25) adapt faster and more easily than people who wait until their ADD is +2.00 or higher. The smaller the difference between zones, the less distortion in the lens, and the easier the adjustment period. Starting early is genuinely better.
"All progressives are the same"
They are very much not. A basic progressive design has a narrow useful corridor and more peripheral distortion. A premium design (like Varilux or Zeiss Individual) uses your specific measurements to create wider corridors and less distortion. For first-time progressive wearers, a mid-range or premium design significantly improves the success rate. This is one area where spending more produces a measurably better product.
The Practical Recommendation
If your ADD power is +1.25 or higher and you wear glasses most of the day, get progressives. Start now rather than later. Give yourself two full weeks to adapt. Choose a quality lens design, not the cheapest option. And if your first pair does not feel right after two weeks, go back and talk to your optician. It might need a fit adjustment, or the lens design might not be the right one for your prescription and lifestyle.
If your ADD is lower than that, you have options. Single vision plus a pair of readers, or single vision with a mild progressive, or just single vision and occasional squinting at small print. There is no wrong answer at the low end. Go with whatever makes your daily life most comfortable.