No-line progressive readers

Where the line went

A lined bifocal bonds a second power into the lower lens, leaving a visible boundary. A progressive lens varies its curvature continuously so magnification increases gradually down the lens. No boundary, so no line to see and no line to cross.

Why that matters in use

Crossing a bifocal line makes the image jump — the classic hesitation on stairs. A progressive removes the jump and adds an intermediate zone in the middle, which is where computer monitors sit. The trade is softer optics toward the outer edges of the lens.

How to use one properly

• Keep the frame high on the bridge so the zones line up with your gaze
• Move your head rather than your eyes to change distance
• Face the page or screen squarely rather than looking through the lens corner
• Expect a few days of learning — see the adjustment guide

Prescription versus over-the-counter

Optician-made progressives are cut to your pupillary distance and correct distance vision and astigmatism. Over-the-counter no-line readers such as OptiReaders Pro use a standard graduated profile with equal power in both lenses, aimed at close work only. The full comparison is on the prescription progressives page.