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A round-seg bifocal is a lens designed for presbyopia where the reading segment is a small, perfectly round circle positioned in the lower portion of the lens. This is one of the oldest bifocal designs and is visually the least obtrusive of the lined bifocals.
read more about round seg bifocal ...The defining characteristic is the circular shape of the near-vision segment. Because the circle is small and visually contained, the line that separates the distance and near powers is less obvious than the straight lines of D-seg or executive bifocals.
The main benefit is aesthetic appeal and a slightly smoother visual transition. The curved top of the segment provides a gentler visual shift than a sharp, straight line. It is also often used in lighter-weight lenses.
A D-segment bifocal has a straight top, offering a clean line across the reading area. A round-seg has a curved top, which slightly restricts the reading field but makes the line less visible on the lens.
The round-seg bifocal provides a more discreet look for backup glasses. This subtle aesthetic is beneficial when you want your corrective glasses to be less noticeable during temporary wear, providing comfortable sight when contacts are out.
Yes, they are still made, particularly for people who want a lined bifocal but prefer the least visible segment line.
The segment size is usually specified in millimeters, such as a 28 mm or 35 mm diameter.
No, like most bifocals, it does not include an intermediate zone for optimal computer viewing.
Round-seg bifocals are often preferred by golfers or laborers who need near vision but want to avoid the sharp corners of a "flat-top" bifocal that can catch the eye during movement. Ask your optician if a Round 24 or Round 28 is best for your activity.
The Vision Council. Guide to Multifocal Lenses (thevisioncouncil.org). 2024.
ABDO. Dispensing Bifocals (abdo.org.uk). 2023.
Review of Optometry. Lenses for Sports (reviewofoptometry.com). 2024.
College of Optometrists. Fitting Multifocals (college-optometrists.org). 2024.