What are wavefront-guided scleral lenses?

What a standard scleral lens leaves behind

A scleral lens works by covering an irregular cornea with a smooth surface and a layer of saline. That neutralizes most of the front surface’s irregularity. But the back surface of the cornea is irregular too in conditions like keratoconus, and a lens can’t smooth that out. In keratoconus, much of the leftover distortion with a rigid lens comes from the back of the cornea.^[3]

These leftover distortions are called higher-order aberrations. Unlike nearsightedness or ordinary astigmatism, glasses can’t correct them. People often describe them as halos, ghosting, double edges on letters, or vision that isn’t crisp even when the prescription seems right. For more on the limits of standard lenses, see vision still not perfect with sclerals?

How a wavefront-guided lens works

The process starts with a standard scleral lens that fits well. Once that lens is finalized, a wavefront aberrometer measures the distortions that remain while you’re wearing it. Those measurements are used to design a custom correction that’s cut into the front surface of a new lens.^[1]

Because the correction is tied to a specific spot over your pupil, the lens needs to sit in a stable, predictable position. Scleral lenses suit this because they provide a stable platform for advanced optics.^[5] Features that reduce rotation, such as a toric landing zone, may help with front-surface optical designs.^[6]

What the studies show

• Randomized crossover trial. In interim results from a single-center, double-blind trial, 31 eyes of 18 people with irregular corneas each wore a standard lens and a wavefront-guided lens for about four weeks in random order. The wavefront-guided lens reduced leftover distortions by 56% on average and improved vision by an average of a little over one line. Of the eyes, 71% gained at least one line, 26% didn’t improve, and 3% did slightly worse. Seventeen of the 18 participants preferred the wavefront-guided lens.^[1]
• Keratoconus case series. In a retrospective review of 22 eyes of 13 people with keratoconus, followed for at least 48 weeks, wavefront-guided lenses reduced leftover distortions by 53% and improved vision by an average of two lines. All patients preferred them, and no adverse events were seen.^[2]
• Adaptation. A 2025 review notes that wavefront-guided corrections may bring vision quality close to that of healthy eyes, especially when people are given time to adapt to the new image.^[3]

The evidence is promising but small, and both studies came from single centers.

Where they fall short

• Availability. In an international survey of scleral lens prescribing, only 3% of lenses had optics designed to correct higher-order aberrations.^[4] The process also means a standard lens is fitted first and a second, custom lens is made from measurements taken through it.
• Not everyone benefits. About a quarter of eyes in the trial didn’t gain a line.^[1] Some vision limits come from parts of the eye a lens can’t reach.
• Fit comes first. If the lens moves, rotates, or settles differently from day to day, a custom correction may not line up.

If you still have bothersome halos or ghosting with a well-fitted lens, ask your fitter whether your remaining blur comes from higher-order aberrations, and whether a wavefront-guided design is worth trying.