Keratoconus is a progressive corneal condition that often goes undiagnosed for years while patients cycle through glasses prescriptions that never quite work. If you or someone you know has an unusually unstable prescription, persistent blurry vision that glasses do not fully correct, or significant light sensitivity and halos, keratoconus is worth specifically ruling out.
It is more common than its name suggests. Estimates put its prevalence at roughly 1 in 2,000 people, and the real number is likely higher because mild cases frequently go undetected until they are moderate or advanced.
What Is Keratoconus?
Keratoconus occurs when the cornea, the clear dome-shaped surface at the front of the eye, gradually thins and bulges forward into a cone shape rather than maintaining its normal rounded curvature. This irregular shape distorts light as it enters the eye, producing blurry, distorted, or ghosted vision that standard glasses lenses cannot fully correct because glasses are designed to work with a regular corneal surface, not an irregular one.
Keratoconus typically first appears in the teens or twenties and progresses at variable rates. In some patients it stabilizes relatively early. In others it continues through the thirties or forties. Early detection and intervention offers the most options for managing progression and protecting vision long term.
Symptoms That Suggest Keratoconus
Vision that blurs or distorts even with corrective lenses, particularly at night or in low contrast situations, is one of the most consistent symptoms. Rapidly changing prescription, often with increasing astigmatism at each exam, is another strong indicator. Increased sensitivity to light and glare, halos or ghosting around lights especially at night, and one eye that is visually significantly worse than the other despite both having been corrected are all patterns worth investigating.
Many patients with keratoconus spend years being told they simply have difficult-to-correct astigmatism. If your astigmatism is high, asymmetric between the two eyes, or inconsistent between appointments, keratoconus should be formally ruled out with corneal imaging rather than assumed to be straightforward astigmatism.
Eye rubbing is worth mentioning specifically. Habitual vigorous eye rubbing is associated with keratoconus progression. The mechanical pressure of rubbing is thought to contribute to the corneal thinning that drives the condition forward. If you are a habitual eye rubber, this is worth discussing with your optometrist regardless of whether you have other symptoms.
How Is Keratoconus Diagnosed?
Keratoconus is diagnosed through corneal topography or tomography, which maps the curvature of the corneal surface in precise detail. This imaging is not part of every routine eye exam but is performed when the clinical picture suggests it, including unusual astigmatism patterns, poor best-corrected visual acuity that does not improve with lens changes, or visible corneal changes observed under slit lamp examination.
Eyes On Optometry provides corneal evaluation as part of our eye disease detection service and through our contact lens exam and fitting assessment for patients where keratoconus is clinically suspected. Early imaging creates a baseline that makes tracking progression over time possible.
Treatment Options for Keratoconus in Edmonton
Spectacle correction works in mild early keratoconus where the corneal irregularity is not yet severe enough to cause distortion beyond what glasses can manage. As the condition progresses, glasses provide diminishing optical benefit because they work with the tear film on the eye surface, not the irregular cornea itself.
Rigid gas-permeable contact lenses are the first-line optical treatment for moderate keratoconus. The rigid lens vaults over the irregular cornea and creates a smooth, regular refracting surface in front of the eye, significantly improving visual quality. Fitting RGP lenses for keratoconus is a specialty skill requiring detailed corneal mapping and careful follow-up visits to assess lens position and fit over the abnormal corneal surface.
Scleral contact lenses are large-diameter rigid lenses that vault entirely over the cornea and rest on the white of the eye, with a reservoir of saline filling the space between the lens and the cornea. They are excellent for advanced keratoconus or for patients who cannot tolerate standard RGP lenses. Our contact lens exam and fitting service includes scleral lens assessment for eligible patients.
Corneal cross-linking is the most important intervention for stopping keratoconus from progressing. It uses UV light combined with riboflavin drops to strengthen the collagen bonds within the cornea, halting further thinning and bulging. It is performed by a corneal specialist and is significantly more effective when done before the cornea has thinned severely. Cross-linking does not restore lost vision. It stops the condition from worsening.
Questions Edmonton Patients Ask About Keratoconus
Q: My prescription has been changing every year for the past three years. Could this be keratoconus?
It could be. Rapid prescription changes, particularly increases in astigmatism, are one of the hallmark patterns of early keratoconus. They can also reflect normal prescription progression in younger patients, so a changing prescription alone does not confirm the diagnosis. Corneal topography imaging is the way to determine definitively whether the corneal shape is irregular in the pattern consistent with keratoconus. If your prescription has been changing faster than expected, ask specifically about corneal mapping at your next exam.
Q: I was diagnosed with keratoconus. Will I eventually go blind?
No. Keratoconus does not cause blindness in the traditional sense. In very advanced cases where the cornea has thinned severely and contact lenses can no longer provide functional vision, a corneal transplant is an option that restores useful vision in the majority of cases. Modern management, particularly early cross-linking and specialty lens fitting, allows most keratoconus patients to maintain functional vision for life with appropriate ongoing care.
Q: At what age does keratoconus usually stop progressing?
Most cases stabilize by the mid-thirties to early forties, though this is not universal. Some patients stabilize earlier. The rate of progression is most rapid in the teenage years and twenties. Cross-linking is most beneficial during the active progression phase, which is another reason early diagnosis matters. Older patients whose condition has been stable for several years without intervention may not need cross-linking if the cornea has already stabilized at an acceptable level of thickness.
Q: Can I wear regular soft contact lenses with keratoconus?
In very mild keratoconus, soft contact lenses may provide adequate vision. As the condition progresses, soft lenses drape over the irregular cornea and still allow the irregular surface to distort vision. RGP or scleral lenses provide better optical results because their rigid surface creates a new regular refracting surface independent of the corneal shape.
Q: Is keratoconus hereditary?
There is a genetic component. First-degree relatives of keratoconus patients have a higher risk of developing it than the general population. If you have been diagnosed with keratoconus, it is worth mentioning to parents, siblings, and children so they can be screened. Corneal topography in first-degree relatives of keratoconus patients is a reasonable precaution even without symptoms.
Book a Keratoconus Assessment in Edmonton
If you have been struggling with glasses that do not fully correct your vision, have a history of rapidly changing prescriptions, or have been told you have high or unusual astigmatism that does not fully explain your symptoms, ask us about a corneal evaluation at your next appointment. Contact Eyes On Optometry to book in Edmonton.