Dr. Nattawut Wanumkarng was invited as a lecturer at the Ocular Surface and Dacryology Symposium, held from 20 to 22 October 2022 at National University Hospital, Singapore. On 22 October 2022, he delivered a lecture on the topic “45 Degree Test in Endoscopic Lacrimal Surgery”, focusing on innovative techniques to enhance precision and outcomes in endoscopic lacrimal surgery.