I believe that the UK CAA would consider intraocular lens replacement as a type of refractive surgery, (if done for refractive error rather than cataract).
They suggest contacting the medical department for advice on revalidation requirements for all types of refractive surgery.
See page 2 of this.
http://www.caa.co.uk/docs/49/SRG_MED...ember2010).pdf
(Page 2 also mentions that mulitifocal implants are not approved by the UK CAA).