Optometrist

Tests to measure visual acuity in children

vision-child-test

Pediatric eye examination

                                            

Age
Type of test
Example of test
3-12 months
Preferential looking
Keeler cards
1-3 years
Vanishing optotypes (looking and/or
naming)
Cardiff cards
2.5 – 4 years
Single or crowded letter or picture
matching
Sheridan Gardner at 3 or 6 metres logMAR or Kay crowded pictures
4-6 years
Crowded letter matching or naming
logMAR crowded, Snellen, Sonksen
Silver

Approximate visual acuity according to age
Age Approximate
Snellen acuity
Birth
6/300
1 month
6/200 – 6/90
3 months
6/90 – 6/60
6 months
6/36 – 6/30
9 months
6/24
1 year
6/18
18 months
6/12
2 years
6/12 – 6/9
3 years
6/9 – 6/6 singles
4 years
6/9 – 6/6 crowded
5 years
6/6 – 6/5
Tests to measure near acuity
Age
Type of test
Example of test
Near acuity at 25cm
2-3 years
Picture Naming
Reduced Kay pictures
6/12 – 6/6
3-5 years
Matching singles
Reduced single Snellen
6/9 – N5
4-6 years
Naming reduced letter
charts
Snellen, logMAR
6/6 or N5
5 years onwards
Reading
McClure reading book
6/6 or N5

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