Snellen chart
（重定向自Snellen test）
![Typical Snellen chart to estimate visual acuity](/Images/godic/202502/11/Snellen_chart.svg5625.png")
A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862. Many ophthalmologists and vision scientists now use an improved chart known as the LogMAR chart.