The claimant also wore bifocals and the collar inhibited the normal compensatory movement of her head to maintain perfect vision. She fell down some steps sustaining further injury. It was held that her difficulties in seeing with her usual spectacles were within the risk created by the original negligence. Unlike "McKew", Mrs. Wieland was not behaving unreasonably in descending the steps and so the chain of causation was not broken. Eveleigh J. said that "...one injury may affect a person's ability to cope with the vicissitudes of life" but all that arises reasonably in the ordinary course of events will not break the chain. Similarly, where the defendant creates a dangerous situation that requires the claimant to take immediate evasive action, the defendant remains liable even if, at the critical moment, the claimant makes the wrong decision and suffers damage that could have been avoided. Contributory negligence used to be a complete defence, but the Law Reform (Contributory Negligence) Act 1945 allows the court to apportion liability for damages between the claimant and the defendant where the claimant's negligence has materially added to the loss or damage sustained. Section 1 provides: The reference in s1(1) to the claimant's share in the "responsibility for the damage" requires a court to consider what contribution the claimant made to their loss or damage, and the degree of blameworthiness. For these purposes, the only requirement is that the claimant's actions contribute to the damage. There is no requirement that the claimant must also have contributed to the initial sequence of events that caused the loss or damage. In "Sayers v Harlow UDC" (1958) 1 WLR 623 having paid to use a public toilet, a 36-year-old woman found herself trapped inside a cubicle that had no door handle. She attempted to climb out by stepping first on to the toilet and then on to the toilet-roll holder, which gave way. The court held that the injuries she suffered were a natural and probable consequence of the defendant's negligence, but that the damages would be reduced by 25% since the claimant had been careless in depending for support on the toilet-roll holder. In some situations, the common law has been overtaken by statute. In "Froom v Butcher" (1976) QB 286 Denning MR assessed the percentage contribution made by a claimant who failed to wear a seat belt (at p295): The wearing of seat belts then became compulsory (see the Wearing of Seat Belts Regulations 1983 and the Motor Vehicles (Wearing of Seat Belts in Rear Seat by Adults) Regulations 1991).