A simple test using standard eye-testing equipment can accurately predict whether laser blended vision surgery will be successful for those with presbyopia, based on findings shared at the 44th Congress of the European Society of Cataract and Refractive Surgeons (ESCRS). The procedure corrects one eye for distance and the other for near vision, relying on the brain to blend the two inputs, and the new screening method helps identify suitable candidates before they undergo the operation.
How the Phoropter Screening Test Predicts Laser Blended Vision Success
The assessment utilizes a phoropter, which is the standard machine found in clinics for eye tests to switch between various lenses. According to Mr. Brendan Cummings, a consultant ophthalmologist at the Wellington Eye Clinic in Dublin, Ireland, who presented the findings, the evaluation begins by determining the correct lenses to maximize a patient’s distance vision. The patient then mentally benchmarks this baseline view as 100%.
Following this initial step, clinicians defocus just one eye to make it short-sighted and ask the patient to compare the modified view to the baseline. The process is repeated for the other eye. If a patient reports that their vision remains at least 80% as good with one eye defocused, clinical indicators suggest they possess the neurological capability to blend the dual images successfully.
Pro Tip: The screening process simultaneously pinpoints a patient’s dominant eye, ensuring that the dominant side is treated for distance vision while the non-dominant eye is corrected for near tasks.
Clinical Study Data and Patient Screening Outcomes
The retrospective study analyzed 1,341 patients who presented with a variety of refractive statuses, including short-sightedness, long-sightedness, and emmetropia, according to presentation details shared at the ESCRS congress. By deploying the phoropter-based test prior to any surgical intervention, clinicians successfully screened out 30 individuals—representing 1.66% of the total cohort—who were deemed poor candidates for the procedure.
Among the remaining patients who proceeded with the operation, the intervention yielded a 96.9% adaptation rate. Joaquín Fernández—the CEO of Qvision, ESCRS Secretary, and Medical Director of the Andalusian Ophthalmology Institute at Vithas Hospitals in Almería, Spain, who did not participate in the study—remarked that as options beyond conventional glasses grow, these assessments provide useful utility for planning treatments and selecting patients.
Understanding Presbyopia and Treatment Alternatives
Presbyopia is the natural deterioration of near-vision focus that typically develops in adults aged 40 and older. As the lenses inside our eyes become less flexible over time, routine activities like reading fine print become increasingly challenging. Historically, individuals relied on reading glasses, bifocals, or multiple pairs of spectacles to manage the condition.
Laser blended vision offers a surgical alternative aimed at restoring functional range without reliance on corrective eyewear. However, because the procedure depends on sensory and neurological adaptation rather than purely mechanical correction, identifying appropriate candidates beforehand remains essential to prevent patient dissatisfaction.
Did You Know?
While advanced technologies are emerging to assess sensory dominance in innovative ways, standard clinic equipment like the phoropter remains widely accessible, making low-tech screening tools highly cost-effective for everyday practice.
Frequently Asked Questions
What is laser blended vision?
It is a surgical procedure for presbyopia that corrects one eye for distance vision and the other for near vision, relying on the brain to combine the two images.
How does the predictive test work?
Clinicians use a phoropter to defocus each eye sequentially while measuring whether the patient perceives their vision to remain at least 80% as clear compared to their full distance baseline.
What percentage of patients adapt successfully after passing the test?
According to research presented at the ESCRS congress, 96.9% of patients successfully adapted to laser blended vision following the screening.
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