AddOn® IOL
The upgrade for pseudophakic eyes

Optimize refraction results and enable greater spectacle independence.

Patented design for safe and stable positioning in the sulcus

Optimized refraction

Post-correction across the entire optical spectrum, individually tailored to the patient.

Treatment upgrades

Upgrade to a multifocal or EDOF function for increased spectacle independence.

Planning spectacle independence

As part of the Liberty2 dual lens system, the trifocal AddOn® makes spectacle independence plannable.

AddOn® sulcus lenses from 1stQ are nothing less than a milestone in functional patient care. The AddOn IOLs are implanted in the sulcus as an addition to the Basis IOL fixed in the capsular bag and thus open up a variety of application possibilities for eyes that have currently only been provided with monofocal function. For example, the trifocal AddOn can be implanted retrospectively or in a single stage together with the capsular bag lens as part of the Liberty2 dual lens system. The AddOn is non-traumatically reversible at any time, even years after implantation. The patented design(1) ensures safe and stable positioning in the sulcus and makes the AddOn an efficient and safe solution for all refractive situations.(2-10)

All AddOn® IOLs at a glance

Sphere/SEQ-10 D to +10 D-10 D to +10 D-5 D to +5 D-5 D to +5 D-3 D to +3 DOn request
Cylinder+1 D to +11 D+1 D to +4.5 D
Additionlow addition+2.25 D; +3 D+3 D+10 D

Patented for the sulcus

The AddOn®IOL is compatible with commonly used capsular bag IOLs, regardless of their design or material. In the process, the patented sulcus design(1) ensures safety and stable positioning in the ciliary sulcus.

Sulcus fit
through four flexible haptics
Rotational stability
through non-torque design
No IOL touch and cell stop
through convex-concave optic
No iris capture
through square design

The AddOn® benefits

  • Full spectrum of refractive corrections(2)(3)(9-12), in particular trifocal upgrades(4)
  • Quality of vision is unimpaired by the additional AddOn edges(9)
  • Non-traumatic reversibility(9)(10)
  • Implantable irrespective of lens status of the pseudophakic eye(5)(7)
  • Single-stage (together with lens in capsular bag) and two-stage implantation possible(9-12)
  • Suitable for eyes with silicone oil tamponade as well as following keratoplasty(8)

Contemporary presbyopia correction

In the dual lens system, the trifocal AddOn® enables increased spectacle independence and a unique degree of flexibility.

Questions about the 1stQ AddOn®

Is the AddOn compatible with all customary capsular bag lenses?

Yes, the AddOn is a sulcus lens that is implanted in addition to the capsular bag lens and is compatible with all commonly used IOLs, regardless of their design or material.

Can an AddOn be implanted in each sulcus?

Thanks to their patented features(1), such as sulcus fit with four flexible haptics and rotational stability thanks to the non-torque design, the AddOn® can be adapted to virtually any sulcus size and shape.

How long after cataract surgery can an AddOn be implanted?

The AddOn lens can be implanted in the capsular bag any time after lens exchange. If a patient subsequently opts for increased spectacle independence, a trifocal AddOn is exactly the right solution.

How long after implantation can the AddOn be explanted again or exchanged with another AddOn?

The AddOn is placed in the sulcus and is therefore non-traumatically reversible at any time – even many years after implantation.(9)(10)

Can an AddOn also be implanted in phakic eyes?

No the AddOn is only designed and patented for implantation in pseudophakic eyes.(1)

Can the AddOn also be implanted in a single stage together with a capsular bag lens?

Yes, the AddOn lens can be implanted together with the capsular bag lens in a single surgical intervention. When it comes to achieving spectacle independence for patients, the Liberty2 dual lens system is worth considering.

What AddOn users are saying

“I use the AddOn lens frequently in clinical practice to expand my options for refractive upgrades or corrections because of its dependable stability.“

Sathish Srinivasan MD, FRCSEd, FRCOphth, FACS, United Kingdom

“I feel very comfortable and safe with planned two-stage trifocality with a Basis IOL in the capsular bag and a trifocal AddOn in the sulcus. The superindication for this technique is RLE or post-LASIK cataract surgery. Refractive surprises should thus be entirely eliminated.”

Kjell Gunnar Gundersen MD, PhD, Norway

“The AddOn can be used to bring pseudophakic patients back to their visual comfort zone at any time.”

Erik L. Mertens MD, FEBO, Belgium

“The AddOn with trifocal array is just great. In combination with the capsular bag lens it provides a high degree of adaptability to refractive situations. Handling and safety are convincing.”

Prof. Dr. Gangolf Sauder MD, Germany

“The main benefit of implanting a trifocal AddOn lens is the relative ease of reversibility at any given time […]. This is a smart option for patients who are particularly uncertain about how to handle aberrations from multifocal IOLs.”

Brian Harrisberg MD, MBBCh, FRACS, FRANZCO, Australia

AddOn® handling

We also assist you with handling, either in person on site during surgery or with digital instructions.


Doctors brochure – AddOn®
Brochure for doctors

Literature and references

(1) Patent #EP 12 181 744 (2013). (2) Gundersen KG, Potvin R. A review of results after implantation of a secondary intraocular lens to correct residual refractive error after cataract surgery. Clinical Ophthalmology 2017:11, pages 1791-1796. (3) Gundersen KG, Potvin R. Refractive and visual outcomes after implantation of a secondary toric sulcus intraocular lens. Clinical Ophthalmology 2020; 14:1337-1342. (4) Palomino-Bautista C (et al). Spectacle independence for pseudophakic patients – Experience with a trifocal supplementary add-on intraocular lens. Clinical Ophthalmology 2020;14:1043.1054. eCollection 2017. (5) Mrochen M (et al). Safety of modern dual-lens systems. Model-based investigation with regard to position tolerance and effects on the optical system. Ophthalmo Chirurgie (Sonderveröffentlichungen, Teile 1-3) 2013. (6) Srinivasan S. Implantation of Scharioth macula lens in patients with age-related macular degeneration: results of a prospective European multicentre clinical trial. BMJ Open Ophthalmol. 2019 Jul7; 4(1):e000322. (7) Reiter N, Werner L, Guan J, Li J, Tsaousis KT, Mamalis N, Srinivasan S. Assessment of a new hydrophilic acrylic supplementary IOL for sulcus fixation in pseudophakic cadaver eyes. Eye (Lond). 2017 May,31(5):802-809. (8) Hassenstein A, Niemeck F, Giannakakis K, Klemm M. Torische AddOn-Intraokularlinsen zur Korrektur hoher Astigmatismen nach pseudophaker Keratoplastik. Der Ophthalmologe. 2017 Jun;114(6):549-555. (9) Khoramnia R, Baur ID, Yan W, Łabuz G, Auffarth GU Comparison of a Presbyopia-Correcting Supplementary Intraocular Lens Combination and a Capsular-Bag Lens: An In Vitro Study. Diagnostics 2023, 13, 1482. (10) Gundersen KG, Gjerdrum B, Potvin R. Efficacy of a Secondary Trifocal Sulcus IOL in Providing Near and Intermediate Vision in Patients with Prior Myopic Laser Vision Correction and Cataract Surgery. Clinical Ophthalmology 2022;16:2219-2226. (11) Albayrak S. et al. Visual performance and patient satisfaction following the implantation of a novel trifocal supplementary intraocular lens. European Journal of Ophthalmology 2021;31(5):2346-2352. (12) Harrisberg BP, Chua AW, Chua MJ, Taher A Comparison of Primary Duet Lens Procedures: In-The-Bag Monofocal with Sulcus Multifocal, and Standard Single Multifocal Lens for Cataract Surgery. Clinical Ophthalmology 2023;17:273-282.