Figure 6.

Ora serrata pressure and stress. A, Elements at the junction of the ciliary body and retina, corresponding to the ora serrata, were measured for stress upon shuttlecock impact. The initial compressive stress on the ora serrata of up to 0.13 MPa corresponds to a contribution of 0.08 MPa in IOP transmitted from the aqueous humor. B, Subsequent ocular deformations/distortions along with IOP pressures of 0.18 MPa contribute to radial/circumferential tensile stresses of up to 0.62 MPa. The red arrows represent tensile stresses, while the blue arrows represent compressive stresses. While the ora serrata experience tensile stress, the retinal portion experiences a peak compressive stress around 0.65 MPa from ocular deformations at the limbus and accumulation of IOP from the vitreous humor, which both contribute to the slow decline in this compressive retinal stress. C to D, Eventually, IOP from vitreous humor induces compressive stresses at the ora serrata, with a peak stress of 0.57 MPa; meanwhile, internal elements of the ciliary body still experience tensile stresses that have not yet alleviated. As the IOP from the vitreous humor distributes posteriorly, the tensile stresses on the ora serrata return. IOP = intraocular pressure.