Femtosecond laser-assisted versus conventional combined phacoemulsification and excimer laser trabeculotomy (Phaco-ELT): a retrospective comparative cohort study

For many older adults, two common eye conditions often arrive together: cataracts, which cloud the eye's natural lens and blur vision, and glaucoma, a disease where pressure builds up inside the eye and threatens to damage the optic nerve. When both are present, doctors face a choice: perform two separate surgeries or try to fix both problems at once. One approach involves a procedure called phacoemulsification, where the cloudy lens is removed and replaced with a clear artificial one, combined with a technique called excimer laser trabeculotomy. This laser treatment uses a precise beam to create tiny openings in the eye's drainage system, allowing fluid to escape and lowering the internal pressure. While the laser part of this combined surgery is well established, the cataract removal part can be done in two ways. The traditional method uses a handheld ultrasonic device to break up the cloudy lens, while a newer, high-tech alternative uses a femtosecond laser to perform the same task with extreme precision. The big question for surgeons and patients has been whether this expensive, high-tech laser assistance actually leads to better results when paired with the glaucoma treatment, or if the standard, proven method works just as well.

A team of researchers at university hospitals in Germany set out to answer this question by looking back at the records of sixty-eight patients who had undergone this combined surgery. They compared the outcomes of eyes treated with the femtosecond laser-assisted cataract removal against those treated with the conventional, traditional method. The goal was to see if the fancy laser made a measurable difference in lowering eye pressure, reducing the need for daily eye drops, or improving vision one year after the operation. The study focused on real-world patients with varying types of glaucoma, ensuring the findings would reflect what happens in actual clinical practice rather than a tightly controlled laboratory setting.

The results showed that the combined surgery was highly effective at its primary job. One year after the operation, the average pressure inside the eye dropped from about eighteen millimeters of mercury to nearly fifteen, a significant reduction that lowered the risk of further vision loss. At the same time, the number of daily eye drops patients needed to control their pressure fell noticeably, and their vision improved. These improvements were clear and statistically strong, confirming that combining the two procedures is a safe and successful way to treat both cataracts and glaucoma in a single session. The surgery also proved to be very safe, with no instances of a specific, serious complication where the back of the eye's lens capsule tears, a risk that surgeons always watch for.

When the researchers directly compared the two techniques, however, the high-tech laser offered no advantage over the traditional method. The amount of pressure reduction, the improvement in vision, and the decrease in medication needs were virtually identical for both groups. Whether the cataract was removed with the femtosecond laser or the conventional handheld device, the final outcome for the glaucoma treatment was the same. The study also found that the most important factor in predicting how much a patient's eye pressure would drop was simply how high the pressure was before the surgery began. Patients who started with higher pressure saw larger drops, while those with lower starting pressure saw smaller changes. Interestingly, a pattern that initially suggested patients with a specific type of glaucoma called pseudoexfoliation might do better turned out to be misleading once other factors were accounted for; the type of glaucoma itself did not determine the success of the surgery.

Over a longer period, the benefits of the surgery remained strong, though the reduction in the number of eye drops needed became less pronounced after the first year. By thirty months, a small number of patients required additional procedures to manage their pressure, but the vast majority remained free from further surgery. The study concludes that while the femtosecond laser is a remarkable piece of technology, it does not provide a measurable benefit when used for this specific combined operation. For patients and doctors, this means the conventional, less expensive method remains a perfectly valid and effective choice, delivering the same high level of safety and pressure control as its high-tech counterpart. The decision to use the laser may then come down to other factors, as the core medical outcome for lowering eye pressure appears to be the same regardless of the tool used to remove the cataract.