It is important to note that Pentacam does not represent the mu-chord in conventional notation. It is known that Kappa angle is positive when the vertex normal is Nasal to the pupil center and negative when vertex normal is Temporal to the pupil. This convention of signs is not followed for the Pentacam reporting of chord-mu, therefore, it is required a conversion to the conventional sign notation. Furthermore, the signs change from left and right eyes. Therefore, it is required to correct the signs before combining right and left eyes in the same sample.
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