Calibrate Distance Practice Result

Free Tumbling E Practice (Near Vision)

This isn't an eye exam. It's a practice version, and only an eye exam can measure your vision.

A 60-second practice with Tumbling E letters at reading distance. It can't check eye health or give you a prescription. No sign-up, nothing to download.

First, calibrate your screen so the letters are roughly the right physical size.

Step 1: Calibrate Your Screen

Place a US quarter flat on your screen over the circle below. Then drag the slider until the purple circle matches the quarter exactly.

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💡 No quarter? You can also use any coin or object with a known diameter. A US quarter is 24.26mm across.

Step 2: Set Your Distance

Position yourself 40 cm (16 inches) from your screen. This is a typical reading distance.

📏 How to measure 40cm:

1 Extend your arm straight toward the screen with a fist. The distance from your eyes to your knuckles is approximately 40cm for most adults.

2 Or use the ruler below: it should be about 15 cm if your calibration matches. Check it with a real ruler, or measure ~2.7 of these lengths from your eyes to the screen.

This line is about 15 cm if your calibration matches

✅ Before you start:

☐ Screen is at arm's length (~40cm / 16")
☐ Room is well-lit (normal indoor lighting)
☐ If you normally wear distance glasses or contacts, keep them on
☐ Wear what you normally read with, if you like
☐ Keep both eyes open

Both eyes open

Keep the screen at about 40 cm (16 inches)

Level 1

Which way is the E pointing?

Your Practice Result

On this screen, at about 40 cm

Smallest letters you read

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10 = smallest letters in this practice

What this result is

⚠️ Not an eye exam. This practice can't measure your vision, diagnose a condition, or replace glasses or eye care. For an eye exam, visit an optometrist or ophthalmologist.

Want a Guided Practice Plan?

Get Visionary offers a few minutes a day of adaptive visual exercises. It's a wellness app: not an eye exam, not a medical device, and it doesn't replace glasses or eye care.

Try Visionary App — Free See the Research

| Try the Contrast Demo →

Frequently Asked Questions

How accurate is this?

It isn't a measurement. The coin calibration keeps letter sizes roughly right on your screen, but screen quality, lighting, distance and familiarity with the Tumbling E task all change what you can read. For a measurement of your vision, see an eye-care professional.

What does this practice show?

Which letter sizes you answered correctly on your screen at about 40 cm (16 inches), as a level from 1 to 10. It doesn't give a 20/20-style score, and it can't detect presbyopia or any other condition.

What if I couldn't read the small levels?

That can happen for many reasons, including your screen and setup. If near vision is uncomfortable, changing, or affecting daily activities, arrange a comprehensive exam with an eye-care professional. This practice can't diagnose a condition or determine the correction you need.

Is this a presbyopia test?

No. It's a practice task, and it can't tell you whether you have presbyopia or anything else. If small print at reading distance has become harder, an eye exam can find the cause and give you the right correction.

Can an online eye test replace an eye exam or give me a prescription?

No. This practice can't measure your acuity or refraction, check eye pressure, or examine the retina, and it doesn't issue prescriptions. Some states allow online refraction services to issue prescriptions after a doctor reviews the data; this page is not one of them and is educational only.

Why does this need a coin to calibrate?

Screens vary from phones to monitors, so the same letter can come out at very different physical sizes. Matching the circle to a coin of known diameter lets the page draw the letters at roughly the intended size for a 40 cm viewing distance.

Related Tools & Guides

→ Contrast Sensitivity Demo → Reading Glasses Calculator → Presbyopia at 40 Guide → Contrast Sensitivity: What the Evidence Says → Gabor Training: Study Schedules Explained → Gabor Patches Explained

Keep reading

How to read your prescriptionOD, OS, sphere, cylinder, axis, ADD, and PD explained.Presbyopia guideCauses, timeline, and every option for managing it.Presbyopia at 40Why reading gets harder and what helps.Can you reverse presbyopia naturally?What the evidence says about exercises, pinholes, and supplements.