Canon EOS REBEL T7i Instruction Manual page 177

3 Correction of Lens Aberrations due to Optical CharacteristicsN
Lens Correction Data
The lens correction data for lens aberration corrections is registered
(stored) in the camera. With [Enable] selected, the peripheral
illumination correction, chromatic aberration correction, distortion
correction, and diffraction correction will be applied automatically.
With EOS Utility (EOS software, p.474), you can check which lenses
have their correction data registered in the camera. You can also
register the correction data for unregistered lenses. For details, refer to
the EOS Utility Instruction Manual.
For lenses incorporating the correction data, it is not necessary to
register the correction data to the camera.
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