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.
近义、反义、联想词
近义词
n.
display, presentation
英英词典
snellen chart n.
display consisting of a printed card with letters and numbers in lines of decreasing size; used to test visual acuity