Modern accounts of chromatic aberrations divide ocular chromatic aberrations into two main categories; longitudinal chromatic aberration ( LCA ), and transverse chromatic aberration ( TCA ).
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Chromatic aberration results from the differential refraction of light depending on its wavelength, causing some light rays to converge before others in the eye ( longitudinal chromatic aberration or LCA ) and / or to be located on non-corresponding locations of the two eyes during binocular viewing ( transverse chromatic aberration or TCA ).