LV: NV Charts

TNR Near Chart

• N point notation - 1 point is 1/72 of an inch
• Easy to convert N12 = half the size of N24
• Rule - divide DV by 3 to get VA@0.25m eg 6/60 = N20 @25cm

Bailey-Lovie

• logMAR chart w/2 to 6 words on a line depending on word length
• Words are unrelated to minimise guessing. Not a good test of overall reading
• Difficult for people w/poor cognition/english

Keeler A

• Log scale so 1.25x intervals from A1 to A20. A7 = newsprint
• A1 = 5 mins of arc at 25cm

IOO Chart

• Rapid assessment of acuity
• Reading text using words kids can recognise in a random order
• Approximate log scale

PNAC

• Designed to establish px's NVA rapidly, ranges from N80 to N5 but uses N and log notation.
• Equal no of words and letters on each page
• Words are related to each other so better for young kids
• Paragraphs of common print size are on the back

Sloan M system (USA)

• 'M' notation @ 40cm eg 1M = letters subtend 5 minutes of arc at 1m, 2M...2m etc
• 1M = newsprint
  

MNREAD

• Continuous text reading-acuity charts
• Measures speed and accuracy as well as print size
• Can also establish size of print that gives highest reading speed