06 Penlight Red/Green (PLRG) Procedure For Screening of Convergence Insufficiency. American Optometric Association website. https://www.aoa.org/documents/optometrists/PLRG-CI-Card.pdf. Accessed September 1, 2019.

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06 Penlight Red/Green (PLRG) Procedure For Screening of Convergence Insufficiency. American Optometric Association website. https://www.aoa.org/documents/optometrists/PLRG-CI-Card.pdf. Accessed September 1, 2019.

06 Penlight Red/Green (PLRG) Procedure For Screening of Convergence Insufficiency. American Optometric Association website. https://www.aoa.org/documents/optometrists/PLRG-CI-Card.pdf. Accessed September 1, 2019.