Cataracts are the major cause of blindness in the world. Cataract surgery, being the most performed surgery in the world today, provide correction by extracting the natural lens from its capsular bag and replaced by an artificial intraocular lens (IOL) implantation. In the UK, almost all patients undergoing cataract surgery by the NHS are given monofocal intraocular lenses (IOLs) which do not correct corneal astigmatic error. It is estimated that around 20% of the population has over 1.50DC of corneal astigmatism. Uncorrected astigmatism not only increase spectacle dependency and reduce quality of life post surgically, but it also adversely affects the overall economic costs. Specialised toric IOLs offer the opportunity to correct pre-existing corneal astigmatism. Previous work has shown a link between reduced vision and balance or mobility. Full correction of refractive error may have greater impact on lifestyle than previously thought.
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Jerk from the centre of mass Visit 1
Timeframe: Baseline assessment will be carried out at study visit 1 before the cataract surgery
Jerk from the centre of mass Visit 2
Timeframe: First reassessment will be carried out at study visit 2 around 3-6 months after the first cataract IOL replacement surgery
Jerk from the centre of mass Visit 3
Timeframe: Final reassessment at study visit 3 around 3-6 months after the second eye cataract IOL replacement surgery