APP and TAPP mice: Stromal corneal nerve occupancy (A), Area under the curve for the acquisition phase of the Barnes maze (B) and Recognition index in the object recognition test (C) for 1 year old APP mice, (N=5–8). Stromal corneal nerve occupancy (D), Area under the curve for the acquisition phase of the Barnes maze (E) and Recognition index in the object recognition test (F) for 4-month old TAPP mice, N=8–10. *p<0.05, **p<0.01, unpaired t test versus Wild type (WT) group.