PUNCTUM dilatation in small children is frequently difficult, but it is facilitated by a fine tip for the initial punctal entry. A set of probes has evolved, consisting primarily of a fine, wire-size tip fashioned at the end of a straight punctum dilator, to aid entry into the puncta (Figure). Even after stimulation of the erector papillae, the small size of the tip (0.4 mm) allows easy entry into the small aperture. The tip is approximately 1 mm in length, and the remainder of the probe is sufficient in size to dilate the punctum, although a separate dilator may be preferred. Early (1962) in the use of these probes, there was concern about the sharp points damaging the canaliculus. However, this has not been a problem in practice. When the vertical portions of the canaliculus are minimized by lateral traction on either the upper or lower lids in order to
Spivey BE. Punctum Dilators for Nasolacrimal Probing. Arch Ophthalmol. 1970;84(1):65. doi:10.1001/archopht.1970.00990040067016
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