Contact Lenses for Keratoconus

The main lens families used for keratoconus include rigid gas permeable lenses, scleral lenses, hybrid lenses, and piggyback systems. Each approach addresses irregular astigmatism differently, and many patients try more than one type before settling on the best fit. For patients who also have specific iris or pupil irregularities alongside keratoconus, pinhole soft contact lenses may also be considered.

Mild keratoconus may respond well to a properly fitted gas permeable lens or hybrid design. Moderate to advanced cases often benefit from scleral lenses because they vault completely over the cone without touching it. Our specialty contact lens fitters evaluate corneal topography maps and other diagnostic measurements to recommend the lens most likely to deliver comfortable, stable vision at your current stage.

Fitting lenses on an irregular cornea requires specialized instruments such as corneal topographers and optical coherence tomography scanners. These tools produce detailed maps of corneal elevation, curvature, and thickness, allowing your fitter to select precise lens parameters. Accurate mapping reduces the number of trial-and-error visits and leads to a better-fitting lens from the start.

Scleral lenses are often the best choice for moderate to advanced keratoconus, especially when smaller RGP or hybrid lenses cannot center properly on a steep cone. Because scleral lenses vault entirely over the cornea and rest on the white of the eye, they provide a stable, comfortable fit even on highly irregular surfaces. Many patients with concurrent dry eye symptoms also benefit because the fluid reservoir keeps the cornea continuously hydrated.

Fitting lenses for keratoconus is more involved than a standard contact lens exam. Your fitter uses corneal topography to map the exact shape of your cornea, then selects a trial lens designed for irregular eyes. Multiple trial lenses may be evaluated in a single visit, and follow-up appointments are common. The entire process typically takes two to four visits before the final lens is ordered.

Piggybacking involves wearing a soft contact lens underneath a rigid gas permeable lens. The soft lens acts as a cushion between the RGP and the cornea, reducing mechanical irritation and improving comfort. This technique is useful for patients who need the optical precision of an RGP but cannot tolerate direct corneal contact.

Because keratoconus can progress over time, regular evaluations are important even after a successful fitting. Most patients benefit from a comprehensive lens assessment every six to twelve months. If the corneal shape changes significantly, a new lens with updated parameters will be needed to maintain clear vision and a safe fit.

In very early or mild keratoconus, some patients may still achieve adequate vision with soft toric lenses. However, as the condition progresses, soft lenses become increasingly ineffective because they conform to the irregular cornea rather than correcting it. Most patients eventually transition to specialty rigid or scleral designs.

Your first visit will include detailed corneal mapping and a discussion of your visual needs and lifestyle. Trial lenses will be placed on your eyes so you can experience the vision improvement firsthand. The fitting may take longer than a standard contact lens appointment, so plan for an extended visit.