What action should be taken if a second grader exhibits over convergence of the left eye after failing screening?

The appropriate action in this scenario is to refer the second grader at once given the presence of over convergence of the left eye after failing screening. Over convergence can be an indication of underlying visual processing issues or conditions like strabismus, which can affect the child's ability to see properly and can have implications for their academic performance and overall development.

Immediate referral is vital because the child may require a comprehensive eye examination by a qualified professional, like an optometrist or ophthalmologist. Early identification and management of visual issues can lead to more effective treatment outcomes and can help prevent further complications related to their vision. Waiting for rescreening or observation could delay necessary intervention, and sending the child home without addressing the issue could put her at risk for ongoing difficulties in visual functioning and learning.