It would be best to know what exactly are the side effects you are experiencing following cataract surgery.
The comparison between multifocal lens and monofocal lens is down to whether the patient wishes to be spectacles independent after cataract surgery. If so, then the multifocal lens would be the lens of choice.
Nevertheless, the monofocal lens is still an excellent choice to help patient restore sight. It’s just that they will still have to rely on the use of spectacles following cataract surgery.