Strange how many "friends" have problems....
EASA allow single focus lenses only, with corrective specs.
From the CAA website:
2. Cataract Surgery
The assessment of individuals following cataract surgery should be done on a case by case basis. This should take into account clinical evidence on recovery times and outcomes from modern day surgery. A pilot can be assessed as fit following cataract surgery from 6 weeks post-operatively.
A report shall be provided from the consultant ophthalmologist who performed the procedure and should include the date of surgery and type of implant used, details of distance and near visual acuities, any post-operative complications, confirmation that the pilot has fully recovered from surgery and that there is no significant photophobia, glare or diplopia.
Note: multifocal and bifocal implants are NOT compatible with certification. Monovision is not recommended and pilot would require well-tolerated multifocal spectacles in order to meet the distance and near vision standards. Accommodating lenses may be acceptable following a review with a consultant aviation ophthalmology adviser.
For Class 1 pilots, an operational multi-crew limitation (OML) may be appropriate if there is evidence of co-morbid disease or procedure or complication that may increase the risk of visual incapacitation.