The world’s thinnest surgical needles have a diameter of 0.03 millimeters and are just 0.8 mm long. And the thread they pull is so fine, at 0.012 mm in diameter, that it is invisible to the naked eye.

To evaluate the role and efficacy of portable X-ray in reliably identifying retained suture needles in ophthalmologic surgical cases. Ophthalmologic 10−0 nylon suture needles were placed into 10 of 20 ...