Interestingly, a higher volume of CD68 labelling was found on average in each retinal microglia in AD compared to control (Fig. 6C; machine control: 14.66 ± 1.533 μm3 (mean ± SEM); machine AD: 28.76 ± 2.365 μm3 (mean ± SEM); p < 0.0001), and this increase persisted even after normalising to the microglia volume (Fig. 6D; machine control: 0.01320 ± 0.001396 (mean ± SEM); machine AD: 0.01715 ± 0.001451 (mean ± SEM); p < 0.0001). The gene discussed is CD68; the disease is Alzheimer disease.