Free Online Eye Test (Near Vision)
A 60-second screening of how well you read small print at arm's length, using the same Tumbling E method clinics use. No sign-up, nothing to download.
First, calibrate your screen so the letters are 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.
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?
Repeat the screen under consistent conditions. If near vision is uncomfortable, changing, or affecting daily activities, arrange a comprehensive exam with an eye-care professional. This browser result cannot diagnose a condition or determine the correction you need.
Is this a presbyopia test?
It screens the symptom presbyopia causes, which is difficulty resolving small print at reading distance. If you are over 40, see clearly at a distance, and this screen shows reduced near acuity in both eyes, presbyopia is the most common explanation, but only an eye exam can confirm it and rule out other causes.
Can an online eye test replace an eye exam or give me a prescription?
No. A screen can estimate acuity but cannot measure your refraction, check eye pressure, or examine the retina. Some states allow online refraction services to issue prescriptions after a doctor reviews the data; this tool is not one of them and is educational only.
Why does the test need a coin to calibrate?
Acuity depends on the physical size of the letters, and screens vary from phones to monitors. Matching the circle to a coin of known diameter lets the page draw letters at the correct size for a 40 cm viewing distance.