The punctum lacrimale is located at the corner where upper eyelid comes together with lower eyelid. It is prominent in many subjects and appears as a “D” shape. The function of punctum lacrimale is to secrete tears to keep proper moisture on the surface of eyeball.
Automatic Classification of Left/Right Iris Images
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(2009). Punctum Lacrimale. In: Li, S.Z., Jain, A. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-73003-5_789
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