It has been reported that Kappa angle has an important role in laser refractive surgery techniques and placement of multifocal intraocular lenses.(1) Anterior segment imaging devices report a 2-dimensional Cartesian displacement that roughly correlates with the concept of kappa angle.(2) Chang-Waring correctly addressed this issue and proposed the term chord mu (µ) or Chang-Waring chord(3) in order to avoid the misunderstandings generated by the literature. This function can represent the chord mu or any other reference points such as pupil center, vertex normal, kappa angle, lambda angle, etc. Any displacement from a reference point to a studied point can be represented by means of this function.
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