Cataract · Premium implant
Toric implant: correcting astigmatism during cataract surgery
When you have significant corneal astigmatism, cataract surgery is the ideal opportunity to correct this defect during the same procedure, thanks to a toric intraocular implant. In a single operation, the clouded lens is replaced and your astigmatism corrected. How it works, candidates, variants and expected results: what you need to know.
What astigmatism is and why it complicates cataract
Corneal astigmatism corresponds to an irregularity in the curvature of the cornea: rather than being perfectly spherical, it takes on a shape close to a rugby ball, with a shorter radius in one meridian and a longer one in the other. As a result, the light rays passing through the cornea do not converge on a single point, but on two separate focal points. Vision becomes blurred and doubled at all distances, even with perfect accommodation.
Before surgery, you compensated for this astigmatism with glasses or corrective contact lenses including a cylinder. During cataract surgery without a toric implant, only the lens is replaced — the corneal astigmatism itself persists after the procedure. You will have to keep wearing corrective glasses with a cylinder, including for distance vision. The toric implant solves this problem by integrating the cylindrical correction into the implant itself.
Key point
The toric implant is a single placement that simultaneously corrects the cataract and the corneal astigmatism, in one procedure. Without a toric implant, the astigmatism persists after the operation and requires glasses.
How a toric implant works
A toric implant integrates, in addition to its spherical power, an oriented cylindrical correction. The optical surface of the implant has two meridians of different power, which compensate for the two irregular corneal meridians. For the correction to be effective, the implant must be oriented precisely within the lens capsule along the astigmatic axis measured preoperatively.
This orientation is the key to the result: a 10° orientation error reduces the correction efficacy by about 33%; a 30° error completely cancels the benefit. Every degree counts. Hence the importance of preoperative corneal marking and intraoperative verification under the microscope. The power of the implant and its alignment are calculated to measure to neutralise the astigmatism of corneal origin, the correction acting directly at the level of the cornea, where the irregularity of curvature arises.
The variants of the toric implant
- Monofocal toric implant — corrects astigmatism and cataract, sharp vision at a single distance (usually distance). Reading glasses remain necessary for near vision. This is the basic version, the most studied and the most predictable.
- EDOF toric implant — such as Vivity Toric, TECNIS Symfony Toric, AT LARA Toric. Adds extended depth of field to the toric correction. Sharp vision from distance to intermediate (dashboard, computer), with very few night halos. Details: EDOF implant.
- Multifocal toric implant — such as AcrySof IQ Restor Toric, FineVision Toric, PanOptix Toric. Combines astigmatism correction with full multifocality (distance + intermediate + near). Maximum independence from glasses, with the trade-off of more pronounced night halos. Details: multifocal implant.
The choice of the toric version is made during the consultation, based on your desired level of independence from glasses and your tolerance for dysphotopsia.
Who is a good candidate for a toric implant
- Corneal astigmatism ≥ 1 dioptre — the usual efficacy threshold. Below 0.75 D, the clinical benefit is marginal. Between 0.75 and 1 D, the indication is discussed case by case.
- Regular corneal astigmatism — measured and confirmed by topography. Irregular astigmatism (keratoconus, post-traumatic cornea) contraindicates the toric implant, because its correction compensates only for the regular axis.
- Favourable biometry — normal anterior chamber depth, intact capsule, strong zonule. The anatomical factors are checked during the preoperative assessment.
- Informed expectations — you have understood that the toric implant corrects your astigmatism but does not eliminate every need for glasses, unless you choose a multifocal toric version.
A first-hand account from a patient with a strong cataract + astigmatism is available in the article Astigmatism and cataract: toric implant testimonial.
Compatible lifestyle profiles
- Precision professions — dentists, watchmakers, surgeons, electronics technicians: uncorrected astigmatism remains a significant handicap even with thick glasses. The toric implant makes sharp vision accessible without glasses for the chosen distance.
- Night drivers — heavy goods vehicle drivers, taxi drivers, night drivers: astigmatism increases the halos around headlights. The monofocal toric implant is often superior here to the multifocal versions (fewer additional halos).
- Outdoor sportspeople — cycling, running, sailing, golf: wearing glasses that are suboptimal during exertion becomes unnecessary.
- Habitual readers — prefer an EDOF or multifocal toric if reading independence is a real priority.
Toric vs monofocal + cylindrical glasses
Many patients hesitate: why invest in a toric implant when you can keep wearing glasses after a standard monofocal? Three concrete arguments make the difference:
- Uncorrected visual quality — without glasses, an eye operated with a standard monofocal and residual astigmatism sees blurred at all distances. The toric implant offers sharp vision without glasses at the chosen distance.
- Durability of the result — the toric implant stays in place for life. Glasses break, get lost, fall out of adjustment, cost money to replace regularly.
- Daily comfort — freedom for sporting activity, beach, pool, shower, night-time. Functional vision without assistance.
Ultimately, the choice depends on your level of astigmatism, your budget and your personal relationship with glasses.
The specific course of toric surgery
Toric implant surgery takes place at the Clinique Sainte-Geneviève, like any cataract surgery, but it involves three additional steps that are specific:
Dr Tourabaly protocol
Preoperative corneal marking at the slit lamp (patient seated, marks at 3 o’clock and 9 o’clock to neutralise the passive cyclotorsion between the seated and lying positions), precise intraoperative alignment on the astigmatic axis, verification of the implant’s stable position at the end of the procedure.
- Preoperative corneal marking — in the seated position, at the slit lamp, just before the procedure. Two reference points are marked on the cornea at 3 o’clock and 9 o’clock. This step neutralises the passive cyclotorsion the eye undergoes when you move from the seated to the lying position.
- Intraoperative alignment — once the implant is injected into the capsule, I orient it precisely on the astigmatic axis calculated by biometry, referring to the marked reference points. The expected precision is below 5°.
- Final verification — checking that the implant is well centred, aligned and stable before the end of the procedure.
The rest of the procedure (phacoemulsification, asepsis, topical anaesthesia) follows the same course as standard surgery — see the complete Sainte-Geneviève pathway.
Expected results
Clinical studies on modern toric implants (AcrySof IQ Toric, TECNIS Toric, AT LARA Toric) consistently report:
- Uncorrected distance visual acuity ≥ 8/10 in 80 to 90% of patients at 3 months after surgery.
- Residual astigmatism ≤ 0.5 D in the majority of well-operated patients with precise biometry.
- Rotational stability — the average rotation of the implant in the capsule remains below 5° over the long term, with fewer than 1 to 3% of patients requiring a revision for excessive rotation.
Key figure
The efficacy threshold of the toric implant is at ≥ 1 dioptre of regular corneal astigmatism. Below this value, the clinical benefit remains marginal.
Specific risks
The general risks of cataract surgery apply identically (endophthalmitis, cystoid macular oedema, retinal detachment — detailed on the surgery page). The toric implant adds two specific risks, which are rare:
- Secondary rotation of the implant within the capsule, in the weeks following placement. Fewer than 3% of patients. Modern materials (hydrophobic acrylic, hydrophilic with stable haptics) and recent platforms minimise this risk.
- Rotation > 10° with significant visual impact — an indication for surgical revision for repositioning, a simple procedure carried out under topical anaesthesia. This situation remains exceptional.
Fees and reimbursement
The surgical procedure and the anaesthesia consultation are fully covered by the French Assurance Maladie, as for any cataract. The specific extra cost of the toric implant is not covered by the French social security system: an out-of-pocket amount applies, varying according to the implant model (monofocal toric, EDOF toric, multifocal toric). Some high-end supplementary health insurers partially cover this extra cost.
A detailed quote is provided to you by my assistant before any decision. All the precise figures are centralised on Cataract fees.
Frequently asked questions about the toric implant
Cataract assessment with corneal topography
IOLMaster 700 biometry + corneal topography at the Cachan or Paris 13 practice, to assess precisely your astigmatism and the indication for a toric implant.
Sources
- Kessel L, Andresen J, Tendal B, et al. Toric intraocular lenses in the correction of astigmatism during cataract surgery: a systematic review and meta-analysis. Ophthalmology. 2016;123(2):275-286. PMID 26601819. Reference meta-analysis on the efficacy of the toric implant vs monofocal for corneal astigmatism.
- Visser N, Bauer NJ, Nuijts RM. Toric intraocular lenses: historical overview, patient selection, IOL calculation, surgical techniques, clinical outcomes, and complications. J Cataract Refract Surg. 2013;39(4):624-637. PMID 23522584.
- Schallhorn JM, Pantanelli SM, Lin CC, et al. Multifocal and accommodating intraocular lenses for the treatment of presbyopia: a report by the American Academy of Ophthalmology. Ophthalmology. 2021;128(10):1469-1482. PMID 33741376. Review of premium implants (including multifocal torics).
- Haute Autorité de Santé. Chirurgie de la cataracte chez l’adulte — recommandations de bonne pratique. HAS, 2018 (updated 2024).
This content provides information about the toric implant and does not replace an individual consultation. The precise indication and the choice of model are discussed after topography and biometry.