Extended depth of focus (EDOF) lenses give a continuous, elongated range of focus rather than two or three discrete focal points. They deliver excellent distance and intermediate vision and a usable, but rarely complete, near range¹. The honest answer to the spectacle independence question is therefore: for most everyday tasks at most distances, yes; for sustained small-print near work, in most patients, no.
This is a feature, not a failing. EDOF optics were designed precisely to avoid the abrupt focal transitions and the more pronounced dysphotopsia (visual disturbances such as glare or haloes) profile of diffractive multifocals. By stretching focus rather than splitting it, they preserve more contrast and produce fewer haloes, at the deliberate cost of the very-near acuity a trifocal can deliver. Patients who spend most of their day at a computer screen, driving, walking, or watching television often achieve genuine spectacle independence with a bilateral EDOF implant². Patients who read paperbacks for an hour at a time, sew, or work with detailed printed text usually still want a light pair of reading glasses for those specific tasks.
Why Counselling Determines Satisfaction
Counselling is therefore not about whether the lens works. It is about which tasks the patient is willing to wear glasses for and which they are not. A patient told before surgery that they will probably want glasses for sustained near work is a satisfied patient when they do. A patient told that an EDOF lens will eliminate glasses entirely is a dissatisfied patient even when the lens performs exactly as designed.
This realism is the foundation of high satisfaction. Spectacle independence is a spectrum, and EDOF lenses sit at a defensible, glaucoma-friendlier point along it.
References
- Pedrotti E, Bruni E, Bonacci E, Badalamenti R, Mastropasqua R, Marchini G. Comparative analysis of the clinical outcomes with a monofocal and an extended range of vision intraocular lens. J Refract Surg. 2016;32(7):436-442.
- Cochener B. Clinical outcomes of a new extended range of vision intraocular lens: International Multicenter Concerto Study. J Cataract Refract Surg. 2016;42(9):1268-1275.
Related Topics
- Why Trifocal Lenses Are the Lens of Choice for the Glaucoma Patient Wanting Spectacle Independence
- Why Ocular Surface Disease Matters Before Premium Lens Surgery
- What Is a Goal-Lens Mismatch in Cataract Surgery?
- Can Glaucoma Patients Have Trifocal Lenses?
- Is Mild Glaucoma a Contraindication to Trifocal IOLs?
- What Level of Glaucoma Is Suitable for Premium IOLs?
- Do Trifocal IOLs Reduce Contrast Sensitivity?
- Do EDOF Lenses Give True Spectacle Independence?
- Is an EDOF Lens the Right Choice for a Glaucoma Patient?
- Can You Monitor Glaucoma After a Trifocal IOL?
- When Is a Monofocal IOL the Right Lens for a Glaucoma Patient?
