Laser (Femto) vs Traditional Cataract Surgery: What’s the Difference?

If you’ve been told you need cataract surgery, you’ll quickly run into a choice: traditional (phaco) surgery or laser-assisted (femto) surgery. Clinics often market the laser option as “advanced” or “bladeless,” which can make the traditional method sound outdated. The reality, supported by large clinical studies, is more balanced — and more reassuring. This guide explains exactly how the two differ, what the evidence actually shows, and how to think about the choice. It is for information only; your surgeon is best placed to advise on your eyes.

First, What Cataract Surgery Actually Involves

A cataract is the clouding of your eye’s natural lens. In both methods, the surgery follows the same essential steps:

1. An incision is made in the cornea.
2. An opening is made in the lens capsule (the “bag” holding the lens)—this step is called the capsulotomy or capsulorhexis.
3. The cloudy lens is broken up and removed (using ultrasound—phacoemulsification).
4. A clear artificial lens (IOL) is implanted in its place.

The difference between traditional and laser surgery comes down to which of these steps are done by the surgeon’s hand-held instruments versus by a computer-guided laser.

Traditional Cataract Surgery (Phacoemulsification)

In conventional phacoemulsification (“phaco”), the surgeon performs the incision and the capsulotomy manually with precision instruments, then uses an ultrasound probe to break up and remove the cloudy lens before implanting the IOL.

This is the most common and most studied cataract procedure in the world, with decades of data and an excellent safety and success record. In experienced hands, it is fast, highly effective, and the global gold standard.

Laser-Assisted Cataract Surgery (FLACS / “Femto”)

In femtosecond laser-assisted cataract surgery (FLACS), a computer-guided femtosecond laser performs several of the early steps that are done by hand in traditional surgery:

• Creating the corneal incisions
• Creating the capsulotomy (a precise, circular opening in the lens capsule)
• Softening and fragmenting the cataract before removal

Because the laser pre-fragments the lens, less ultrasound energy is typically needed to remove it. The IOL is still implanted by the surgeon. FLACS was approved by the US FDA in 2010.

What the Evidence Actually Shows

This is where it pays to look past the marketing. Multiple large meta-analyses — pooling thousands of eyes from randomized controlled trials — have compared the two methods. The findings are remarkably consistent:

Final vision is essentially the same. A 2025 meta-analysis of 46 randomized controlled trials (8,871 eyes) found laser-assisted surgery produced slightly better corrected vision at one week, but no significant difference in vision beyond the first week or in the medium-to-long term. Earlier meta-analyses reached the same conclusion: any early advantage evens out, and both methods deliver excellent final visual acuity.

The laser is more precise on certain steps. Studies consistently show FLACS produces a more precise, reproducible capsulotomy and may achieve better positioning of the implanted lens, which can translate into more predictable refractive outcomes.

The laser reduces ultrasound energy. FLACS significantly lowers the phaco energy and effective phacoemulsification time needed. In theory this is gentler on the cornea — which may be useful for dense, hard cataracts or eyes with a low corneal endothelial cell count.

Safety is comparable. Major complication rates — such as posterior capsule tears, macular swelling, and raised eye pressure — are similar between the two methods. Both are considered very safe.

The honest bottom line from the research: Both FLACS and traditional phaco are safe and effective, and for most routine cataracts the final visual result is comparable. The laser offers precision advantages on specific steps and may help in particular cases, but it is not a guaranteed “better outcome” for everyone — and it costs more.

Side-by-Side Comparison

Feature	Traditional (Phaco)	Laser-Assisted (FLACS)
Incision & capsulotomy	By surgeon’s hand	By computer-guided laser
Lens fragmentation	Ultrasound	Laser pre-softens, then ultrasound
Ultrasound energy used	Standard	Reduced
Capsulotomy precision	Excellent (surgeon-dependent)	Highly reproducible
Final visual outcome	Excellent	Excellent (similar long-term)
Major complication rate	Low	Low (similar)
Track record / evidence	Largest, decades of data	Strong, since 2010
Cost	Lower	Higher

So, Which Should You Choose?

There is no universally “best” option — the right choice depends on your eye and your priorities:

• Traditional phaco is an excellent, proven choice for the vast majority of routine cataracts, with outstanding outcomes and lower cost.
• Laser-assisted surgery may offer advantages for dense cataracts, eyes needing maximum precision, or when combined with premium lenses (toric or multifocal/trifocal) where exact lens positioning matters more.

Critically, the surgeon’s skill and the lens (IOL) you choose usually influence your final vision more than the laser-versus-manual decision itself. A skilled surgeon achieves excellent results with either method.

About Cataract Surgery at Netram Eye Foundation

Netram Eye Foundation is a super-speciality eye hospital in Greater Kailash II, South Delhi, led by Dr. Anchal Gupta. Our team evaluates your cataract type, corneal health, and visual goals to recommend the most appropriate surgical approach and lens for your eyes — not a one-size-fits-all package.

Book a cataract evaluation at our Greater Kailash centre to discuss the right option for you.

Frequently Asked Questions

Is laser cataract surgery better than traditional surgery? Large studies show both methods are safe and effective, with similar final vision in the medium to long term. Laser surgery offers more precise capsulotomy and lower ultrasound energy, which can help in specific cases, but it is not guaranteed to give better vision for every patient — and it costs more.

Is laser cataract surgery safer? Major complication rates are similar between laser-assisted and traditional surgery. Both are considered very safe procedures.

What is the main advantage of femto laser cataract surgery? Its main advantages are a highly precise, reproducible opening in the lens capsule, better lens positioning, and reduced ultrasound energy — which may be particularly useful for dense cataracts or when implanting premium lenses.

Does laser cataract surgery give better vision? Some studies show slightly better vision in the first week, but the difference generally disappears afterward. Final visual outcomes are comparable between the two methods.

Is laser cataract surgery worth the extra cost? That depends on your specific eye and lens choice. For routine cataracts, traditional surgery delivers excellent results. The laser may add value for complex cases or premium lenses. Your surgeon can advise whether it benefits you.

Which is better for a dense or hard cataract? Because the laser reduces the ultrasound energy needed, it may be gentler on the cornea in dense cataracts — though traditional surgery also remains effective. This is a case-by-case decision.

References

1. Femtosecond laser-assisted cataract surgery versus conventional phacoemulsification: a meta-analysis of 46 randomized controlled trials (8,871 eyes). Scientific Reports. 2025.
2. Comparing efficacy and safety of FLACS vs conventional phacoemulsification: systematic review and meta-analysis (41 RCTs, 9,310 eyes). PubMed. 2024.
3. Ye Z, Li Z, He S. A Meta-Analysis Comparing Postoperative Complications and Outcomes of FLACS versus Conventional Phacoemulsification. J Ophthalmol. 2017.
4. Efficacy and safety of FLACS versus conventional phacoemulsification: a meta-analysis of RCTs. Scientific Reports. 2015;5:13123.
5. Chee SP, Yang Y, Wong MHY. Randomized Controlled Trial Comparing FLACS with Conventional Phacoemulsification on Dense Cataracts. Am J Ophthalmol. 2021;229:1–7.

Medically reviewed by Dr Anchal Gupta, Senior Eye Surgeon, Netram Eye Foundation. This article is for general information and is not a substitute for a personalised consultation with a qualified ophthalmologist. Clinical figures cited describe published study results and do not represent outcomes at any specific clinic.