Figure 8 Elasticity and resilience properties of Bruch's membrane‐choroid samples from normal and AMD donors in response to pressure spikes and drops. For each donor sample, the increase in arc length to ascending 250–500 Pa steps of applied pressure was quantified up to a maximum of 3000 Pa. Pressure was then raised to 4900 Pa (a) and the corresponding changes in arc length followed as a function of time over 10 minutes. Pressure was then reduced by 3000 Pa (b) and responses recorded for a further 7 minutes. There was no difference in the response of normal or AMD samples of similar age. The major part of the arc length stabilisation occurred within 15 seconds of the pressure rise. There is a suggestion of a slightly slower stabilisation in AMD samples. Vertical dotted lines represent physiological intraocular pressures (1 mm Hg  =  133.32 Pa).