I believe that the Arcscan Insight® 100 is the best anterior segment Ultrasound machine on the market presently. It has the ability to scan the eye with the patient focused on a target. This allows measurements on the visual axis that no other anterior segment Ultrasound machine can do.
Simply love my 2nd pair of Rudy with prescription lens. First was perception and now impulse with clip on. Excellent recommendation, Comfortable and yet versatile. A good combination, transition with polarised clip on.