A visual acuity test measures how clearly you can identify letters at a specified viewing distance. PeekVision.io provides a preliminary online visual acuity screening that can be completed using a desktop or compatible browser.
The screening tests the right eye, left eye, and both eyes separately and reports results using familiar Snellen-style levels such as 20/20, 20/40, 20/80, and similar values.
Start the Visual Acuity TestOnline Visual Acuity Assessment
PeekVision provides a browser-based visual acuity screening that presents progressively smaller letters to help estimate how clearly each eye can see. The test screens the right eye, left eye, and both eyes and uses display calibration and a calculated viewing distance to improve consistency across devices.
What Is Visual Acuity?
Visual acuity describes the ability to distinguish fine detail at a particular distance. In the United States, distance visual acuity is commonly expressed using Snellen notation.
A result of 20/20 is commonly used as a reference for normal distance visual acuity. A result such as 20/40 means that larger letters were required compared with the 20/20 reference under comparable testing conditions.
Common Snellen-Style Vision Levels
| Vision Level | General Screening Meaning |
|---|---|
| 20/20 | Common reference for normal distance visual acuity |
| 20/25 | Slightly below the 20/20 reference |
| 20/40 | Larger letters are required than at 20/20 |
| 20/80 | Noticeably larger letters are required |
| 20/200 | Substantially larger letters are required |
These descriptions are intended for general screening education only. A browser-based result should not be used to diagnose an eye condition.
How the PeekVision Visual Acuity Test Works
- Calibrate your screen first. PeekVision will calculate an appropriate viewing distance for your display.
- Use your usual distance glasses or contacts if appropriate.
- Cover the left eye and test the right eye.
- Cover the right eye and test the left eye.
- Finish with both eyes open.
- Read progressively smaller five-letter lines.
- Review your screening report after completing the test.
Why Test Each Eye Separately?
Testing the right and left eyes individually can help identify a difference between the two eyes that may be less obvious when both eyes are open.
If one eye repeatedly performs noticeably differently from the other, a professional eye examination may be appropriate.
What Can Affect an Online Visual Acuity Test?
Browser-based testing can be influenced by:
- Screen size
- Browser zoom
- Operating-system display scaling
- Viewing distance
- Room lighting
- Screen brightness
- Whether the non-tested eye is fully covered
- User responses
What Does a Visual Acuity Test Not Measure?
Visual acuity alone does not measure every aspect of eye health. PeekVision.io does not measure intraocular pressure, retina health, optic nerve health, corneal health, pupil reactions, or the exact sphere, cylinder, and axis values used in an eyeglass prescription.
When Should You See an Eye-Care Professional?
Consider an eye examination if your screening repeatedly shows reduced visual acuity, one eye performs differently from the other, or you are experiencing difficulty seeing in everyday life.
Sudden vision loss, severe eye pain, new flashes or floaters, or an eye injury should be evaluated promptly by a qualified eye-care professional.
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