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New IOL calculation formulas and adjustable technologies improve refractive outcomes in post-RK cataract patientsNew Technologies Improve Vision for Patients with Cataracts and RK

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Key Takeaway
Consider new-generation formulas, AI algorithms, and adjustable IOLs to improve refractive outcomes in post-RK patients.

This narrative review explores the complexities of calculating intraocular lens (IOL) power in patients who have undergone prior radial keratotomy (RK). The authors synthesize current evidence regarding how altered corneal morphology affects refractive outcomes following cataract surgery.

The review highlights that refractive outcomes are significantly improved when utilizing new-generation IOL calculation formulas, artificial intelligence algorithms, and adjustable IOL technologies. These advancements address the inaccuracies often found in standard formulas for post-RK eyes. Additionally, the review discusses intraoperative considerations, management of postoperative complications, and the application of small-aperture IOLs.

While the review identifies these technological improvements as effective, it is important to note that this is a narrative synthesis of existing research rather than a primary trial. The scope includes an assessment of corneal biomechanical and optical changes post-RK but does not provide specific trial-level data or p-values. Clinical application should consider the limitations of current standard formulas in this specific patient population.

How this fits prior evidence

This narrative review addresses a gap in managing complex cataract cases by focusing on patients with prior radial keratotomy (RK). It complements existing evidence regarding surgical interventions for refractive errors and visual acuity improvements, though it focuses specifically on the impact of RK on IOL power calculation. The findings do not directly relate to the outcomes of combined phacoemulsification and angle filtering or the use of Mingmu Dihuang Tang.

This review looked at how doctors calculate the correct lens power for patients who have cataracts and a history of radial keratotomy (RK). RK is a procedure that changes the shape of the cornea, which can make it difficult to predict the final vision outcome after cataract surgery.

The findings show that newer technologies are making these surgeries more successful. Specifically, new-generation calculation formulas, artificial intelligence algorithms, and adjustable intraocular lenses (IOLs) have shown improved results for these patients. These tools help account for the changes in the eye caused by previous RK procedures.

Because this is a narrative review of existing research rather than a new clinical trial, it summarizes current progress instead of providing new raw data. Patients with both conditions should talk to their eye doctor about how these specific technologies might apply to their unique vision needs.

What this means for you:
Newer formulas and adjustable lenses help improve vision for patients with cataracts who previously had RK surgery.

Common questions

How does prior RK surgery affect cataract surgery?

Radial keratotomy (RK) changes the shape of the cornea. These changes can make it difficult for doctors to calculate the correct power for an intraocular lens during cataract surgery, which may impact the final vision outcome for the patient.

What new technologies help improve outcomes?

New-generation calculation formulas, artificial intelligence algorithms, and adjustable intraocular lenses (IOLs) have shown improved results. These tools help doctors better manage the challenges caused by previous RK surgery during the cataract procedure.

Are these new methods safe for patients?

The review highlights that newer technologies and formulas improve outcomes, but it does not report specific side effects or safety data. You should speak with your eye surgeon to discuss which technology is best for your specific case.

Study Details

Study typeSystematic review
EvidenceLevel 1
PublishedJul 2026
View Original Abstract ↓
Radial keratotomy (RK) was a refractive procedure widely used to correct myopia from the 1980s to the 1990s. Although this technique has been gradually replaced by modern laser corneal refractive surgery, a large number of post-RK patients are now entering their senior years and requiring cataract surgery. The altered corneal morphology after RK poses unique challenges for intraocular lens (IOL) power calculation, including changes in the relationship between anterior and posterior corneal curvatures, difficulty in predicting effective lens position, irregular corneal astigmatism, and diurnal fluctuation of refraction. In recent years, with the development of new-generation IOL calculation formulas, artificial intelligence algorithms, and adjustable IOL technologies, the refractive outcomes of cataract surgery in post-RK patients have significantly improved. This narrative review summarizes the changes in corneal biomechanical and optical properties after RK, evaluates the reported accuracy of existing IOL formulas for post-RK eyes, discusses intraoperative considerations and postoperative complication management, and prospects the application of novel adjustable IOLs and small-aperture IOLs in this patient population.
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