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Nearly 1 in 3 cataract patients also has astigmatism. Learn how toric intraocular lenses correct both during a single surgery for sharper, clearer vision.
If you've been told you have both cataracts and astigmatism, you're not alone — nearly one in three patients preparing for cataract surgery has enough astigmatism to blur their vision even after their cataract is removed. The good news? Modern cataract surgery offers an elegant solution that addresses both problems at once: the toric intraocular lens (IOL).
What Is Astigmatism?
A perfectly shaped cornea — the clear front window of the eye — is round like a basketball, bending light evenly onto the retina. With astigmatism, the cornea is shaped more like a football, curved more steeply in one direction than the other. Light entering the eye focuses at two different points instead of one, causing blurred or distorted vision at every distance, glare, and shadowing around letters and lights.
Astigmatism is extremely common and usually present from birth. Glasses and contact lenses can compensate for it, but many people don't realize it can also be corrected during cataract surgery.
Cataracts and Astigmatism: Two Problems, One Surgery
A cataract forms when the eye's natural lens gradually becomes cloudy, dimming and blurring vision. During cataract surgery, that cloudy lens is removed and replaced with a clear artificial lens implant. Here's the key point: a standard lens implant restores clarity, but it does nothing for astigmatism. If you have significant corneal astigmatism and receive a standard lens, you will most likely still need glasses for both distance and near vision after surgery.
That's where the toric IOL comes in.
How Toric IOLs Work
A toric IOL has different focusing powers built into different meridians of the lens — a mirror image, in effect, of your cornea's uneven curvature. When the lens is precisely aligned inside the eye, it neutralizes the astigmatism, allowing light to focus at a single sharp point on the retina.
Before surgery, we take detailed measurements of your cornea's shape and the exact axis of your astigmatism using advanced corneal imaging. During the procedure, the toric lens is rotated into position along that axis with a high degree of precision. The surgery itself is the same safe, quick, outpatient procedure as standard cataract surgery — typically 15 to 20 minutes, with numbing drops and light sedation.
How Effective Are Toric IOLs?
Toric IOLs are highly effective — large clinical studies show they reliably reduce astigmatism and give better uncorrected distance vision and greater freedom from glasses than standard lenses (see references below). That said, it's important to have realistic expectations: no procedure can guarantee 100% correction of all astigmatism. A small amount of residual astigmatism may remain after surgery due to the limits of preoperative measurement, individual healing, astigmatism arising from the back surface of the cornea, or slight rotation of the lens after implantation. In a small number of cases, glasses, a laser touch-up, or repositioning of the lens may be recommended to fine-tune the result.
Who Is a Good Candidate?
You may be a good candidate for a toric IOL if you have cataracts along with about 1 diopter or more of regular corneal astigmatism. During your evaluation we'll also examine the overall health of your cornea and retina to make sure a toric lens will deliver its full benefit.
Patients with irregular astigmatism from conditions like keratoconus, or with certain corneal scars, may be better served by other approaches — something we'll discuss in detail at your consultation.
What to Expect After Surgery
Most patients notice sharper, crisper distance vision within days of surgery, with far less dependence on glasses for driving, television, and daily activities. Reading glasses are still typically needed after toric lens surgery, since the standard toric IOL is set for one focusing distance. For patients who want to reduce their need for glasses at all distances, toric versions of multifocal and extended-depth-of-focus lenses are also available — you can read more in our earlier post on multifocal IOLs.
It's worth knowing that toric IOLs are considered a premium lens option. Insurance and Medicare cover the cataract surgery itself, while the astigmatism-correcting upgrade is an out-of-pocket cost. Many of our patients find the freedom from distance glasses well worth it.
Clearer Vision Starts with a Conversation
Cataract surgery happens once in a lifetime for each eye — it's the ideal opportunity to correct astigmatism you've lived with for decades. If you've noticed cloudy, dim, or distorted vision, we'd be happy to evaluate your eyes and help you decide whether a toric IOL is right for you.
Call Eye Care of East Bay to schedule your cataract and astigmatism evaluation today.
References
- Kessel L, Andresen J, Tendal B, Erngaard D, Flesner P, Hjortdal J. Toric Intraocular Lenses in the Correction of Astigmatism During Cataract Surgery: A Systematic Review and Meta-analysis. Ophthalmology. 2016;123(2):275-286.
- Visser N, Bauer NJ, Nuijts RM. Toric intraocular lenses: historical overview, patient selection, IOL calculation, surgical techniques, clinical outcomes, and complications. Journal of Cataract & Refractive Surgery. 2013;39(4):624-637.
- American Academy of Ophthalmology. Toric Monofocal Intraocular Lenses for the Correction of Astigmatism During Cataract Surgery: Ophthalmic Technology Assessment. Ophthalmology. 2023.
Disclaimer: This article is provided for general educational purposes only and is not intended as medical advice. It should not be used to diagnose or treat any condition, and it does not replace an examination and consultation with a qualified eye care professional. Individual results vary. Please contact our office to discuss your specific situation.