Calibrate Distance Test Results

Free Near Vision Eye Test

First, let's calibrate your screen so the test is accurate.

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 standard 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 calibrated ruler below — it's exactly 15 cm. Use a real ruler to verify, or measure ~2.7 of these lengths from your eyes to screen.

This line is exactly 15 cm based on your calibration

✅ Checklist before starting:

☐ 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
☐ Do NOT wear reading glasses

👁️ Testing: Right Eye

Cover your left eye with your hand

Level 1

Which way is the E pointing?

👓

Your Near Vision Results

At 40cm reading distance

Right Eye

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Left Eye

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What This Means

Near Vision Scale

20/20 20/40 20/80 20/200

⚠️ Disclaimer: This is a screening tool, not a medical diagnosis. Results depend on screen calibration, viewing distance, and lighting. For a comprehensive eye exam, visit an optometrist or ophthalmologist.

Want to Improve Your Score?

Gabor patch brain training has been clinically shown to improve near visual acuity by 1-2 lines on the reading chart.

Try Visionary App — Free See the Research

| Test Contrast Sensitivity →

Frequently Asked Questions

How accurate is an online eye test?

Online eye tests provide a screening estimate, not a clinical diagnosis. This test uses screen calibration to ensure accurate optotype sizing, and the Tumbling E method used in clinical settings. However, screen quality, lighting, and distance precision affect results. For a definitive assessment, visit an eye care professional.

What does this eye test measure?

This measures near visual acuity — how well you see small details at reading distance (40cm). Results are in Snellen notation (like 20/20 or 20/40). This is relevant for detecting presbyopia, the age-related loss of near focus affecting most people over 40.

Why do you test each eye separately?

Each eye can have different acuity levels. Testing separately reveals if one eye is significantly weaker, which may indicate conditions like amblyopia or asymmetric presbyopia that should be evaluated by a doctor.

What should I do if my results are poor?

If you scored 20/50 or worse, we recommend seeing an optometrist for a comprehensive exam. In the meantime, you can try Gabor patch training — research shows it can improve near acuity by 1-2 lines on the chart. Eye drops are another option for immediate temporary improvement.

Related Tools & Guides

→ Contrast Sensitivity Test → Visual Age Calculator → Presbyopia at 40 Guide → How to Improve Contrast Sensitivity → How Long Does Training Take? → Reading Glasses Calculator