What parameter is tested in preschool-aged children at a distance position?

Visual acuity is a critical parameter tested in preschool-aged children at a distance position because it measures the clarity or sharpness of vision. This assessment typically involves showing the child letters, shapes, or pictures on a distance chart to determine how well they can see at various distances.

Evaluating visual acuity at a distance is important for early detection of any vision issues that may affect a child's learning and development. Since preschool-aged children are also beginning to engage in activities that require good distance vision—such as playing sports or watching classroom presentations—checking their visual acuity ensures they can perform these tasks effectively.

Testing parameters like color perception, depth perception, and eye coordination are also valuable, but they are often assessed differently or at various stages of development. Visual acuity, however, provides a fundamental insight into a child's overall visual health and is commonly prioritized in early vision screenings.