Final answer:
The most appropriate vision acuity test for a preschool child is the Snellen letter chart.
Step-by-step explanation:
The most appropriate vision acuity test for a child who is in preschool is the Snellen letter chart. The Snellen chart is a standardized arrangement of letters in decreasing size that is presented to a subject at a distance of 20 feet to test visual acuity. It provides a rough generalization of a person's acuity based on the normal accepted acuity.