The intra-ocular lens in humans is sometimes surgically replaced, in cataract surgery or following blunt trauma . The replacement artifical lens can sometimes be designed to allow focal accommodation where the natural lens had lost that ability . This surgery necessitates a small circular hole being cut in the collagen of the lens capsule. Sadly in approximately 4.00 % of surgeries the lens capsule ruptures, leading to a serious loss of visual acuity for the patient . The rupture of the lens capsule arises from surgical damage to the biopolymer networkdamage to collagen networks in general has been studied using crosslinked semiflexible biopolymer networks , and the rupture of the lens capsule has been studied using finite element methods and measured experimentally . As yet no link has been made between the micro-scale behaviour of collagen networks and the macro-scale rupture of the lens capsule. This work aims to provide a mechanistic study of the rupture of collagen networks using a combination of a simplified graph representation and a coarse grained polymer model. The simplified graph representation allows for a robust exploration of how structural features are linked to mechanisms of rupture, and the coarse grained polymer model allows access to relatively long simulation timescales . A graph based model also provides a powerful way to include well-defined defects, and combine individual defects systematically. The coarse grained polymer model combined with the graph model means that we can observe the dynamics and mechanical response of biopolymer networks containing a range of defects.