In a clinical study of n=384 subjects, researchers investigated the patient characteristic factors that correlate with identification of IV cannulation sites with normal eyesight and evaluated a new infrared vein finding (VF) technology device (Veinsite) in identifying IV cannulation sites.

The VF technology (Veinsite) identified an average of 9.1 (95% CI 8.6–9.5) possible cannulation sites compared with conventional method (CM) [average of 5.8 (95% CI5.4–6.2)]. Seventy-six obese subjects had an average of 4.5 (95% CI 3.8–5.3) and 8.2 (95% CI 7.4–9.1) veins viewable by CM and VF, respectively. In dark skin subjects, 9.1 (95% CI 8.3–9.9) veins were visible by VF compared with 5.4 (95% CI 4.8–6.0) with CM.

Abstract:
http://bja.oxfordjournals.org/content/early/2013/02/04/bja.aet003.abstract
Br. J. Anaesth. (2013)doi: 10.1093/bja/aet003First published online: February 5, 2013