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