Tears are directed to the upper and lower punctum. Negative pressure is created, drawing the tears into the sac, where they drain through the nasolacrimal duct and enter the nose through the valve of Hasner below the inferior turbinate (arrow).
All content on the Academy’s website is protected by copyright law and the Terms of Service. This content may not be reproduced, copied, or put into any artificial intelligence program, including large language and generative AI models, without permission from the Academy.