"I spoke with Jerry Rodrigues about Denselight and their IP regarding blood glucose sensing and he seemed very excited about the possibilities, saying that if the company could bring this vertical to market (which they have been attempting to do for 5 years) that it would be disruptive, literally stealing an $8 billion market from the current participants. He said they had run into some difficulties with the FDA but felt the issues were not insurmountable." That's very interesting. It would be very interesting to find out, what are the difficulties with the FDA.

Also interesting: I found an article called Iris as a reflector for differential absorption low-coherence interferometry to measure glucose level in the anterior chamber" that explicitly mentions the use of fiber pigtailed SLDs from Denselight: "For this work we used two fiber pigtailed SLDs (Denselight Inc., Singapore) with center wavelengths at 1310 nm (FWHM bandwidth Δλ = 50 nm) and at 1625 nm (FWHM bandwidth Δλ = 50 nm), respectively."(Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4570116/ )