Mar 5, 2018 · Probing for NLD Syringing and probing: • only performed if the puncta are patent. • Anaesthetic. • Instil adequate topical anaesthesia. • Punctal dilation by a blunt dilator gently to enlarge the puncta. • The lower lid should be pulled laterally to straighten the canaliculus prior to probing. • Use a punctal wire probe which can be ...