Table 4. Comparison of SD-OCT/histology ‘correlation constant’ between present and prior studies.

Layer	Ferguson et al.	Fischer et al.	Huber et al.	Cebulla et al.
Outer Segment/Inner Segment/External Limiting Membrane/	0.91	0.94	…	0.50
Outer Nuclear Layer	1.14	1.10	…	0.58
Outer Plexiform Layer	0.87	…	…	…
Inner Nuclear Layer	0.70	0.77	…	…
Inner Plexiform Layer/Ganglion Cell	0.80	0.88	…	…
Retinal Nerve Fiber Layer	1.17	…	…	…
Total Retinal Thickness	0.96	0.93*	1.05*	0.66*

*The correlation constants in all prior studies were not reported but calculated by ‘extrapolating’ from the data presented in those studies.