Sloan Letter Prop. Near Card (#729000)

Features: 

• Sloan Letter near vision card with Proportionally-spaced lines; line sizes range from 20/400 to 20/10 (6/120 to 6/3) equivalent.
• Attached 16-inch (40 cm) measuring cord ensures proper screening distance.
• Printed on two sides. 7" x 9" (17.8 cm x 22.9 cm).