Vision Span Drills: Can You Really Widen Your Reading Span?
Speed reading courses say you can train your eyes to take in whole lines. Here is what eye-tracking research shows, and how to use span drills if you still want to try them.
Vision span is how much text you can use in one eye stop: about 3–4 letters left and 14–15 letters right of where you are looking. It's limited mainly by sharp vision, and research has not shown that drills widen it for real reading (Rayner et al., 2016). Word pyramids and letter drills can be useful focus practice, but don't expect them to raise your reading speed.
Why You Can't Read a Whole Line at Once
Your vision is only sharp in a tiny area. It gets blurrier quickly as you move away from the point you're looking at:
- Central vision (about 1°–2°): sharp enough to read, but it only covers a few letters at a time.
- Just outside the center (up to about 5°): blurry, but you can still preview word lengths and first letters.
- Further out: you see layout and movement, but you can't read words.
That's why your eyes stop about every 7–9 letters, for about 200–250 milliseconds each time (Rayner, 1998). Most of reading time is spent on those stops, understanding words. Moving your eyes less doesn't help much if your brain still needs that time to take in the language.
What the Drills Are
Span drills ask you to keep your eyes on a center point and notice what's on either side. You'll often see them sold in big numbers, such as "900 drills", but no research supports any particular number or schedule. There are two common types:
- Letter and number flashes: random characters at growing distances from the center, such as
K 4 • 9 X. Because they don't form words, you can't guess them. - Word pyramids: two words that move further apart on each line. You try to notice both without looking away from the center.
You will get better at these with practice. The question is whether that carries over to reading, and so far the evidence says it doesn't (Rayner et al., 2016).
🚀 Practice the 900-Drill Protocol Digitally
Free Interactive ToolOur free Vision Span Trainer has word pyramids and letter flashes, with a visual angle display, adjustable pacing and a recall check.
Launch Peripheral Vision Span Trainer→If You Want To Try Them
- Keep sessions short: 5 minutes is plenty. Stop if your eyes feel tired.
- Sit at a normal distance: about arm's length from your screen.
- Measure the real thing: take a reading speed test before you start and again after a couple of weeks. If it doesn't change, spend the time reading instead.
- Keep reading: reading more and building your vocabulary are the best-supported ways to get faster.
Frequently Asked Questions
What is vision span?▼
Vision span, also called perceptual span, is the area of text you take useful information from in one eye stop. In skilled English readers it runs from about 3–4 letters left of where you are looking to about 14–15 letters right (Rayner et al., 2016).
What is the difference between foveal, parafoveal, and perifoveal vision?▼
Foveal vision is the small central area, about 1° to 2°, where vision is sharpest. Parafoveal vision extends to about 5° on each side: it is blurrier, but you can still preview word lengths and first letters. Peripheral vision is everything further out, where you can see layout and movement but can’t read words.
Do word pyramids improve reading speed?▼
There is no good evidence that they do. You’ll get better at the drill, but eye-tracking research does not show that this widens the span you use in real reading, which is limited mainly by sharp vision (Rayner et al., 2016).
Can expanding vision span cause eye fatigue or headaches?▼
They can tire your eyes, because holding your gaze still is unusual work. If your eyes feel sore, stop, look at something far away and blink. See an eye doctor if headaches or eye pain continue.