AAPOS Critical Line Vision Chart Book

Spiral-bound, multi-sided, distance visual acuity eye charts in full threshold and critical line formats that can be hung on a wall or held in the hands for 10-ft. screening.

• Sloan Letters for when children know random letters
• LEA SYMBOLS(r) for preschoolers and for children who do not yet know random letters.
• Full-Chart Threshold and Single Critical Line formats
• Threshold screening involves beginning at the top of an eye chart and moving down the chart until the child or adult misses 3 of 5 optotypes.
• Critical line screening uses only the line on which the child or adult should correctly identify 3 of 5 optotypes according to age.
• Children ages 3 years should correctly identify 3 of 5 optotypes on the 20/50 line.
• Children aged 4 years should correctly identify 3 of 5 optotypes on the 20/40 line.
• Children aged 5 years and older, and adults, should correctly identify 3 of 5 optotypes on the 20/32 line.