@Crikeyrob as fmf said nothing to worry , not sure if you read...

@Crikeyrob as fmf said nothing to worry , not sure if you read the entire application which is quite lengthy , but there are a number of hints and references thru out that allude to medical application and prob more so cataract surgery and contact lense application,the three ref listed below discuss how a miscalculation in key areas can render a lens to be ineffective and finally the light source being of fibre optic tube source .neverless was an interesting read and assists with greater understanding of how WTB tech works and it's unique qualities. If info already posted opologies as read yours early and had compiled reply but had to leave for the day before could post. 3 main ref below.
Pachymetry
Pachymetry is the measurement of corneal thickness. Corneal thickness can be important in assessing corneal diseases, intraocular pressure, ocular hypertension, and a patient's eligibility for refractive surgical procedures (Y. Li et al. (2010). “Pachymetric mapping with Fourier-domain optical coherence tomography.” J. Cataract Refract. Surg. 36(5): 826-31, hereby incorporated by reference). The use of optical coherence tomography (OCT) to generate pachymetry maps has been well demonstrated using both time-domain and Fourier-domain OCT systems (see for example Y. Li et al. (2010)). Pachymetry maps are generated by calculating the corneal thickness along each of these scans. It is desirable to obtain high density pachymetry maps by either acquiring more meridional scans, or by sampling the cornea more densely, as it minimizes the probability of missing smaller regions of pathology. However, denser sampling would require a longer scan time, and would, in turn, make the data more susceptible to eye motion. A method for generating a denser pachymetry map without motion-related error would therefore be desirable.

Keratometry
Keratometry is the measurement of the curvature of the anterior surface of the cornea. A number of different instrument types can be used to determine the curvature. Often, measurements are taken not by true keratometers but by corneal topographers, which provide simulated keratometry (Sim-K) readings. These do not directly measure the x, y, and z coordinates of the points on the corneal surface, but instead generally use the reflection of incident light by the cornea to measure its shape. The most popular type of modern corneal topographer is the Placido system, which projects multiple light concentric rings on the cornea. The reflection is captured, and then the height of each point of the cornea is extrapolated from the reflection. Computer software and algorithms can analyze the data and display the results in various maps; typically they measure the deviation of reflected rings and calculate the curvature of the corneal surface points in the axial direction, which can then be used to compute Sim-K. Lens 109 is used to collimate the illuminating light exiting the fiber and to focus the reflected light back into the fiber for collection. Reference light derived from the same source 101 travels a separate path, in this case involving fiber 103 and retro-reflector 104with an adjustable optical delay.