Comparative Analysis of Early Visual Outcomes in Keratorefractive Lenticule Extraction with VisuMax 500 vs. VisuMax 800: A Clinical Study from Cureus

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VisuMax Technology Advances: New Study Compares Corneal Shaping Procedures

May 3, 2024
By Archyde News Desk

A Recent study has compared the initial visual outcomes of two VisuMax laser platforms – the 500 and 800 – used in Keratorefractive Lenticule Extraction (KLEx), a minimally invasive refractive surgery. The research, published by Curet, offers valuable insights for both surgeons and patients considering this vision correction option.

KLEx involves creating a small, lens-shaped piece of corneal tissue, called a lenticule, which is then removed to reshape the cornea and correct nearsightedness. The VisuMax femtosecond laser is a key tool in this procedure, and this study focused on whether the newer 800 platform offered advantages over the established 500 model.

Study Findings: initial Visual Acuity

Researchers evaluated several parameters, including uncorrected distance visual acuity (UDVA), spherical equivalent, and corneal topography. Initial results suggest comparable visual outcomes between the two VisuMax platforms.Patients undergoing KLEx with both the 500 and 800 systems achieved notable improvements in vision.

The study indicates that both VisuMax systems deliver precise and predictable results in KLEx procedures. This is reassuring for patients and surgeons alike, confirming the reliability of this technology for vision correction.

Understanding Keratorefractive Lenticule Extraction (KLEx)

KLEx is gaining popularity as an alternative to LASIK, particularly for individuals with higher degrees of myopia. It is indeed considered a minimally invasive procedure, preserving more of the corneal tissue compared to conventional LASIK.This can be particularly beneficial for patients with thinner corneas or those at higher risk of dry eye.

The VisuMax laser utilizes femtosecond technology, delivering ultra-short pulses of light to create the lenticule with exceptional precision. This precision contributes to the procedureS safety and effectiveness. Patients considering refractive surgery shoudl discuss all available options with their ophthalmologist to determine the most suitable approach.

frequently Asked Questions About KLEx and VisuMax

What is the primary benefit of KLEx over LASIK?

KLEx preserves more of the cornea’s natural structure, potentially reducing the risk of long-term complications like dry eye and corneal instability.

How does the VisuMax laser contribute to the precision of KLEx?

The VisuMax laser uses femtosecond technology, delivering incredibly precise and controlled energy pulses to create the corneal lenticule.

Is KLEx suitable for all patients with nearsightedness?

Not all patients are ideal candidates. A thorough eye examination is necessary to determine suitability based on corneal thickness, prescription, and overall eye health.

What is the recovery process like after KLEx surgery?

Recovery is typically faster than with LASIK, with many patients experiencing improved vision within a few days. Full stabilization usually occurs within a few weeks.

Are there any risks associated with KLEx?

As with any surgical procedure, there are potential risks, including infection, inflammation, and visual disturbances. These are rare, but should be discussed with your surgeon.

What is the difference between VisuMax 500 and VisuMax 800?

The VisuMax 800 is a newer generation platform with potential enhancements in speed and efficiency,though initial studies suggest comparable visual outcomes to the 500 model.

How long do the results of KLEx typically last?

KLEx provides long-lasting vision correction,with most patients enjoying stable vision for many years. However, age-related vision changes may still occur over time.

What were the primary visual parameters assessed in the Cureus study to compare the outcomes of SMILE surgery using the VisuMax 500 and VisuMax 800?

Comparative Analysis of Early Visual outcomes in Keratorefractive Lenticule Extraction wiht VisuMax 500 vs. VisuMax 800: A Clinical Study from Cureus

Understanding Keratorefractive Lenticule Extraction (SMILE)

SMILE surgery, or Small Incision Lenticule Extraction, has rapidly become a popular choice to LASIK for myopia correction and astigmatism treatment. This minimally invasive procedure utilizes a femtosecond laser to create a lenticule – a small,lens-shaped piece of corneal tissue – which is then removed through a small incision,reshaping the cornea and improving vision. The VisuMax laser from Carl Zeiss Meditec is the industry standard for SMILE procedures. However, advancements in laser technology have led to iterations like the VisuMax 800, prompting examination into its impact on surgical outcomes compared to the earlier VisuMax 500 model. This article delves into a recent clinical study published in Cureus, analyzing the early visual outcomes of SMILE performed with both systems.

Study Overview: Cureus Clinical Findings

The Cureus study focused on a retrospective analysis of patients undergoing SMILE surgery. Researchers compared key visual parameters between two groups: those treated with the VisuMax 500 and those treated with the visumax 800. The primary outcomes assessed included:

Uncorrected Distance visual Acuity (UDVA): Measuring vision without glasses or contacts.

Spherical Equivalent (SE): A measure of the overall refractive error.

Astigmatism Correction: the degree to which astigmatism was reduced.

Contrast Sensitivity: The ability to distinguish between shades of gray.

Corneal Aberrations: Measurements of optical imperfections in the cornea.

Postoperative Complications: Incidence of issues like suction loss or flap-related problems (though SMILE doesn’t involve a traditional flap).

Key Differences Between VisuMax 500 and VisuMax 800

The VisuMax 800 represents an evolution of the original VisuMax 500.The primary upgrade lies in its increased repetition rate – the speed at which the laser pulses are delivered.This translates to:

1. Faster Procedure Times: The 800 generally completes lenticule creation more quickly.
2. Reduced Energy Delivery: Higher repetition rates allow for lower pulse energy, potentially minimizing thermal effects on surrounding corneal tissue.
3. Potentially Improved Tissue ablation Quality: The faster, more precise laser pulses may contribute to smoother lenticule edges.

These technical differences are hypothesized to influence surgical precision and, consequently, visual outcomes.

Comparative Analysis of UDVA and Refractive Outcomes

The Cureus study revealed statistically notable differences in UDVA at 1 day post-op, with the VisuMax 800 group demonstrating slightly better visual acuity. This early advantage appeared to stabilize by the 1-month follow-up, with both groups achieving excellent vision.

VisuMax 500: average UDVA at 1 month: 20/20 or better in 95% of patients.

VisuMax 800: Average UDVA at 1 month: 20/20 or better in 98% of patients.

Regarding refractive outcomes, the VisuMax 800 showed a trend towards achieving a closer target refraction, minimizing residual myopia or hyperopia. The mean SE residual refraction was slightly lower in the VisuMax 800 group, indicating more accurate correction.

Contrast Sensitivity and Corneal Aberrations

Contrast sensitivity is a crucial aspect of visual quality, notably in low-light conditions. The Cureus study indicated a modest, but statistically significant, betterment in contrast sensitivity in the VisuMax 800 group at 1 week post-op. This suggests that the reduced energy delivery and potentially smoother lenticule edges may contribute to better visual function.

Analysis of higher-order aberrations (HOAs) – subtle distortions in vision – revealed no significant differences between the two groups. This suggests that both systems are capable of performing SMILE with minimal induction of these aberrations. Maintaining corneal optical quality is paramount in refractive surgery, and both platforms appear to perform well in this regard.

Safety Profile and Complications

The incidence of complications was low in both groups, consistent with the generally favorable safety profile of SMILE surgery. There were no statistically significant differences in the rates of suction loss, incomplete lenticule separation, or other postoperative issues. This reinforces the notion that both the VisuMax 500 and 800 are safe and effective tools for performing SMILE.

Benefits of the VisuMax 800: A Summary

Based on the cureus study and broader clinical experience, the VisuMax 800 offers several potential benefits:

Faster Surgical Time: Improved efficiency in the operating room.

Enhanced Early Visual Recovery: S