Distance Eye Chart for vision testing at 20 Feet
Visual acuity range 20/100 to 20/16
Includes red green bars for easy use as a color screener
Eye chart measures 23 X 35.5 cm (9 X 14 in.)
Traditional Sloan optotypes
Sloan optotypes are highly calibrated to a 5x5 grid. This grid helps to create a uniform difficulty throughout the 10 optotypes. Each optotype takes up a similar space and creates a uniform blur when they are out of a patient's visual acuity range. This is an essential factor that makes Sloan optotypes so reliable and accurate in visual acuity testing.