Visual acuity assessment in children

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Diagnostic Intervention


Visual acuity is defined as the ability to visualise two objects as separate or the resolving power of the eye. It is defined as the smallest object that can be recognised at a particular distance. Visual acuity assessment remains a challenge for the ophthalmologist and needs to be correctly assessed for the early diagnosis of refractive errors, amblyopia, and other ocular pathologies


Normal visual acuity in various age groups are

At birth - 6/120

4 months-6/60

6 months-6/36

1 year-6/18

2 years- 6/6

Table 1 summarises visual acuity milestones according to age

Visual AcuityAssessment for Various Age Groups


Optokinetic nystagmus

Catford drum test

Preferential Looking test

Teller's acuity cards

Lea's gratings

Visual evoked potential

1-2 Years

Worth's Ivory ball test

Boeck Candy test

Screening test for young children and retards (STYCAR) test

2-3 years

Cardiff Acuity test

Miniature toy test

Coin test

Lea symbol test

3-5 years

Allen's picture test

Sheridan letter test

Lippmans HOTV

Snellens chart

Tumbling E chart

Landlot C chart



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