Online Snellen Eye Chart
Test your vision with our digital Snellen eye chart. Free online visual acuity test with standard 20/20 vision screening, distance adjustment, and comprehensive vision assessment results.
How to Use the Snellen Eye Chart
Set Your Test Distance
Choose your preferred unit (feet or meters) and set the appropriate distance from your screen. Standard distance is 20 feet or 6 meters.
Position Yourself Correctly
Sit at the specified distance from your screen in good lighting. Cover one eye with your hand to test each eye separately.
Read the Eye Chart Lines
Start from the top line and read each line of letters. Click 'Can Read' to continue or 'Cannot Read' when you reach your limit.
View Your Vision Results
Get your visual acuity score (like 20/20), vision assessment, and professional recommendations for your eye health.
Key Features
Standard Snellen Chart Testing
Authentic digital Snellen eye chart with progressive letter lines from 20/200 to 20/10 visual acuity, using standard optometric letters and sizing.
Adjustable Test Distance
Customize your testing distance in feet or meters to accommodate different screen sizes and testing environments for accurate results.
Interactive Vision Assessment
Step-by-step guided testing with clear instructions, progress tracking, and immediate feedback for each line of the eye chart.
Comprehensive Vision Results
Detailed visual acuity results with professional recommendations, vision scale reference, and color-coded assessment indicators.
What is a Snellen Chart and Visual Acuity?
A Snellen chart is the standard eye chart used by eye care professionals to measure visual acuity - how clearly you can see at a distance. The chart displays letters in progressively smaller sizes, with each line corresponding to a specific visual acuity measurement like 20/20, 20/40, etc. Our digital Snellen chart provides an authentic vision screening experience with standard optometric letters and proper sizing ratios for accurate assessment.
Why Use Our Digital Snellen Chart?
Professional-Grade Testing
Authentic Snellen chart with standard optometric letters, proper sizing ratios, and visual acuity measurements from 20/200 to 20/10.
Flexible Distance Settings
Adjustable test distance in feet or meters to accommodate different screen sizes and testing environments for accurate results.
Interactive User Experience
Guided step-by-step testing with clear instructions, progress tracking, and immediate visual feedback for each line.
Comprehensive Assessment
Detailed vision results with professional recommendations, vision scale reference, and color-coded visual acuity indicators.
Frequently Asked Questions
What visual acuity measurements does the Snellen chart test?
Our digital Snellen chart tests visual acuity from 20/200 (legally blind threshold) to 20/10 (excellent vision), with standard measurements including 20/100, 20/70, 20/50, 20/40, 20/30, 20/25, 20/20, and 20/15.
How accurate is this online eye test compared to a professional exam?
This is a screening tool that uses authentic Snellen chart standards, but it cannot replace a comprehensive eye examination by an eye care professional. Use it for initial screening and monitoring, but consult an optometrist or ophthalmologist for accurate diagnosis.
What distance should I sit from my screen for the test?
The standard distance is 20 feet (6 meters), but you can adjust based on your screen size. Larger screens may require greater distance, while smaller screens may need closer positioning for accurate results.
Should I test each eye separately?
Yes, cover one eye with your hand and test each eye individually. This helps identify vision differences between eyes and provides more accurate assessment of your visual acuity.
What does 20/20 vision mean?
20/20 vision means you can see clearly at 20 feet what should normally be seen at that distance. 20/40 means you need to be 20 feet away to see what someone with normal vision can see at 40 feet.
Can I use this test if I wear glasses or contacts?
Yes, you can test with or without corrective lenses. Testing without correction shows your natural vision, while testing with glasses/contacts shows your corrected vision.
When should I see an eye care professional?
If you score 20/50 or worse, experience vision changes, eye strain, headaches, or haven't had an eye exam in over two years, schedule an appointment with an eye care professional for comprehensive evaluation.
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