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Posterior Corneal Astigmatism

Posterior corneal astigmatism has become increasingly recognised as a factor that should be taken into account when planning cataract surgery. It is a term that has become almost necessary for calculators, nomograms and formulae to consider and for optical devices to attempt to measure. It is both important and fashionable, yet few ophthalmologists have a firm grasp of the relatively simple scientific principles underlying its importance. It is a topic better expressed by images than with words. This video aims to demystify the optical properties of posterior corneal astigmatism, our current methods of assessing it and its incorporation into surgery.