Structurally normal eye with equal visual acuity and normal stereopsis.

Diagnosed with amblyopia or constant strabismus, categorized based on the GSE.

Amblyopia:

• VA <20/40 and 2 logMAR lines difference in normal eye
• Mild amblyopia (>20/40)
• Moderate amblyopia (20/40 and <20/100)
• Severe amblyopia (≥20/100 or worse)
• Bilateral amblyopia: >4 years age VA<20/40 OU including high hyperopia or high astigmatism.

Strabismus:

• Constant: >2 PD at near and or distance.
• Intermittent: strabismus that could be controlled intermittently either through fusional mechanisms or a compensatory head position.

Amblyogenic factor categorization:

• 'Anisometropia'- (1.5 Diopters (D) or more difference in refractive error between the two eyes.
• 'hypermetropia' (≥3.5 D),
• 'myopia' (≥-4.0 D),
• 'astigmatism' (≥1.5 D).
• 'structural abnormalities' of the eye will not be excluded, but will be considered to have vision loss if visual acuity is 20/40 or worse.

(no long-term harm to patient if referral is delayed, however the patient does have conditions that might benefit from monitoring): Equal visual acuity and no structural abnormality with any of the following: Amblyogenic factor, intermittent strabismus, structural abnormalities, refractive error, reduced stereopsis.

Subject is scanned with a 2.5 second pediatric vision scanner device test.

'Anisometropia'- (1.5 Diopters (D) or more difference in refractive error between the two eyes.

'hypermetropia' (≥3.5 D), 'myopia' (≥-4.0 D), 'astigmatism' (≥1.5 D). 'structural abnormalities' of the eye will not be excluded, but will be considered to have vision loss if visual acuity is 20/40 or worse.