Astigmatism can cause blurred or distorted vision because the eye does not focus light evenly in all directions. When astigmatism occurs together with moderate or high myopia, glasses and contact lenses may be effective, but some people may prefer a surgical vision-correction option.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Toric ICL is a specialized version of the Implantable Collamer Lens designed to correct myopia along with certain levels of astigmatism. Instead of reshaping the cornea, the lens is implanted inside the eye and has a specific optical orientation that corrects the patient's astigmatic prescription.
If you are exploring ICL as a vision-correction option, you can learn more about the procedure on our ICL treatment page.
What Is a Toric ICL?
A Toric ICL is a type of phakic intraocular lens designed to correct myopia and astigmatism. Like a standard ICL, it is placed inside the eye while the natural crystalline lens remains in place.
The key difference is that a Toric ICL has different optical powers along different meridians of the lens. This allows it to compensate for the uneven focusing caused by astigmatism.
The lens therefore needs to be positioned at a specific axis inside the eye. Correct orientation is an important part of achieving the intended refractive correction.
How Does Astigmatism Affect Vision?
In an eye without significant astigmatism, the cornea and other optical structures focus incoming light relatively evenly toward the retina.
With astigmatism, the cornea or, less commonly, the natural lens has different curvatures in different directions. Instead of light focusing at one clear point, it can form different focal lines, resulting in blurred or distorted vision.
This can affect both near and distance vision and may cause symptoms such as:
- Blurred or distorted vision
- Difficulty seeing fine details
- Eyestrain
- Headaches after prolonged visual tasks
- Difficulty seeing clearly at night
How Does a Toric ICL Correct Astigmatism?
The basic principle is similar to correcting astigmatism with a toric contact lens or toric spectacle lens: the optical power is different in different directions.
During preoperative planning, the ophthalmologist determines the amount of astigmatism and its axis. The appropriate Toric ICL is then selected based on the patient's refractive measurements and eye anatomy.
Once implanted, the lens provides optical correction for both components of the refractive error:
- Spherical correction: Addresses the patient's myopia.
- Cylindrical correction: Addresses the astigmatism.
- Axis orientation: Positions the cylindrical correction in the correct direction.
Because the cylindrical component has a specific orientation, the Toric ICL must remain appropriately aligned inside the eye.
Why Is Lens Alignment Important?
Alignment is one of the most important features of Toric ICL surgery. A Toric ICL has a designated axis that needs to correspond with the axis of the patient's astigmatism. If the lens rotates away from its intended position, the cylindrical correction may become less effective.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
This is different from a standard spherical ICL, where the lens does not have a cylindrical axis that needs to be maintained. The ophthalmologist therefore pays particular attention to lens positioning during surgery and may check the lens orientation during follow-up examinations.
What Happens If a Toric ICL Rotates?
Some degree of postoperative rotation can occur, particularly during the early healing period. Small changes in orientation may have little effect, but significant rotation can reduce the intended astigmatic correction.
If the lens has rotated enough to affect vision, the ophthalmologist may evaluate its position and determine whether repositioning is appropriate. This is one reason postoperative follow-up is important after Toric ICL implantation.
How Is the Correct Toric ICL Selected?
The lens is not selected simply according to the glasses prescription. Several measurements are considered before surgery. The evaluation may include:
- Manifest and/or cycloplegic refraction when appropriate
- Amount of myopia
- Amount and axis of astigmatism
- Corneal measurements
- Anterior chamber depth
- Eye dimensions and anatomy
- Corneal endothelial cell density
- Overall eye health
Modern ICL planning may also use detailed corneal imaging and other biometric measurements to improve lens selection and alignment planning.
What Is the Difference Between a Standard ICL and a Toric ICL?
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
| Feature | Standard ICL | Toric ICL |
|---|---|---|
| Primary correction | Myopia | Myopia with astigmatism |
| Cylindrical power | No | Yes |
| Specific axis required | No | Yes |
| Lens orientation | Important for proper positioning | Particularly important because the toric correction has a specific axis |
| Natural lens | Remains in place | Remains in place |
Who May Be a Candidate for Toric ICL?
Toric ICL may be considered for people who have both myopia and an amount of astigmatism that falls within the approved correction range of the specific lens.
However, refractive power is only one part of the assessment. The eye must also have suitable anatomy and adequate ocular health for implantation. A potential candidate generally needs to have:
- A stable refractive prescription
- Myopia and astigmatism within the appropriate lens range
- Sufficient space inside the eye for the implant
- Adequate corneal endothelial cell health
- Suitable anterior chamber anatomy
- No significant eye condition that would make implantation inappropriate
Can Toric ICL Correct High Myopia and Astigmatism Together?
Yes, in appropriately selected patients, a Toric ICL can address both myopia and astigmatism with a single implanted lens.
This can be particularly relevant for people whose prescriptions combine significant myopia with clinically meaningful astigmatism. However, the exact correction range depends on the specific lens available and its approved indications.
A comprehensive preoperative assessment is necessary to determine whether the patient's complete prescription falls within the available correction range.
How Accurate Is Toric ICL for Astigmatism?
Toric ICL can provide effective correction of astigmatism in appropriately selected patients. Clinical studies have reported good refractive outcomes and improvements in uncorrected visual acuity after toric phakic IOL implantation.
However, the final result depends on several factors, including the accuracy of preoperative measurements, lens selection, surgical positioning, postoperative lens alignment, and the individual healing response. It is therefore important not to view the procedure as a guarantee of completely eliminating every refractive error.
What Happens During Toric ICL Surgery?
The surgical process is broadly similar to implantation of a standard ICL, but additional attention is given to the toric axis.
- Preoperative measurements: The eye is measured to determine the appropriate lens power and axis.
- Lens preparation: The selected Toric ICL is prepared for implantation.
- Small eye incision: The surgeon creates the required entry into the eye.
- Lens insertion: The folded ICL is inserted and positioned behind the iris.
- Axis alignment: The Toric ICL is carefully oriented according to the planned axis.
- Position check: The surgeon confirms that the lens is appropriately positioned before completing the procedure.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Is Toric ICL Better Than Toric Contact Lenses?
They serve different purposes. Toric contact lenses sit on the surface of the eye and provide temporary correction, while a Toric ICL is surgically implanted inside the eye to provide a long-term refractive correction.
Some people may prefer contact lenses because they do not require surgery. Others may consider an ICL when they want to reduce their dependence on glasses or contact lenses and meet the requirements for implantation.
The choice depends on your visual needs, tolerance of contact lenses, eye health, prescription, and willingness to undergo surgery.
The Bottom Line
Toric ICL is a specialized form of Implantable Collamer Lens designed to correct myopia and astigmatism together. Its key feature is a cylindrical optical correction that must be positioned at the appropriate axis inside the eye.
Accurate preoperative measurements, appropriate lens selection, and stable postoperative alignment all contribute to the visual result. Because Toric ICL is an intraocular procedure, candidacy also depends on the overall anatomy and health of the eye.
If you have both significant myopia and astigmatism, a comprehensive eye evaluation can determine whether Toric ICL is an appropriate option for your particular prescription and eye characteristics.
