Fig. 12. Minute changes in depth through the corneal lens of the convergence point of beams from different light sources. LG: laser beam at 532 nm, TR:
tungsten lamp through interference filter for red (kmax = 683 nm), TG: tungsten lamp through interference filter for green (kmax = 516 nm), T: tungsten
lamp without filters, LR: laser beam at 650 nm. All images were taken by changing the light source, but without adjusting the microscopic objective or
specimen position. The images are aligned at the same horizontal level. The images for LG are arranged at either side, and a white line passing through the
convergence points for the two is drawn to enable comparison with the same points in other images.