To pass a line on the Snellen chart, a child must identify how many symbols correctly?

The correct answer indicates that to pass a line on the Snellen chart, a child must correctly identify four to six symbols. This range is based on established guidelines for assessing visual acuity in children. The Snellen chart is designed to measure a person's visual sharpness, and the number of symbols identified correlates to a child's ability to see at specific distances.

In clinical settings, identifying four to six symbols reflects an adequate level of visual acuity for children, ensuring that they can discern details necessary for tasks such as reading or recognizing objects at a distance. This benchmark helps healthcare professionals determine whether a child's vision is within the normal range or if further assessment or intervention may be needed. The choice of four to six symbols strikes a balance, allowing for small variations in performance while still generally indicating satisfactory vision.