The assessment of a 4-year-old child's visual acuity demonstrates 20/30 vision in the left eye and 20/40 vision in the right eye using the Snellen eye chart. This means:

Rationale: A. Normal visual acuity for a 4-year-old is generally around 20/25 in each eye. B. Vision of 20/30 in one eye and 20/40 in the other indicates reduced visual acuity, which is abnormal for this age and warrants further evaluation to rule out amblyopia, refractive errors, or other ocular pathology. C. While picture or “E” charts are used for younger children who cannot read letters, a 4-year-old may be able to use a standard Snellen chart, and the findings indicate decreased acuity regardless. D. Astigmatism cannot be diagnosed solely based on these Snellen chart readings; additional testing such as refraction is required.