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The near zone width is the horizontal size of the designated reading area at the bottom of a progressive lens. This measurement defines the usable side-to-side space available for the eyes to read text or perform close tasks without moving the head. A wider near zone provides more reading comfort.
read more about near zone width ...Progressive lenses feature a corridor of gradually increasing power that widens into the near zone. The width of this final zone is determined by the lens design. A wider zone means less peripheral distortion is present at the bottom of the lens, making reading easier.
Progressive lenses vary in how they allocate space to different zones:
The width of the near zone directly impacts reading comfort. A narrow reading area forces the wearer to constantly move their head side-to-side to scan lines of text, leading to fatigue and neck strain. A wider zone allows the eyes to move more freely, supporting prolonged close work.
The near zone width is limited by the amount of aberration that the manufacturer allows on the side of the lens. Wider zones require more advanced, complex designs to minimize distortion.
Yes, advanced designs needed for wider, clearer zones are generally found in premium lenses.
No, the width is fixed by the lens manufacturer's design, but the fit can optimize its position.
Yes, but it is often the entire horizontal width of the segment, with no side distortion.
If you spend many hours doing close-up work and find your progressive lenses have a "near zone" that is too narrow, ask about "office lenses" or "occupational progressives." These provide a much wider field for reading and intermediate computer work.
The Vision Council. Progressive Lens Designs (thevisioncouncil.org). 2024.
Review of Optometry. Solving Progressive Problems (reviewofoptometry.com). 2023.
ABDO. Dispensing Multifocal Lenses (abdo.org.uk). 2024.
College of Optometrists. Fitting Progressive Lenses (college-optometrists.org). 2024.