Keratoconus: Early Diagnosis, Symptoms and Modern Treatment

Keratoconus is a progressive eye condition in which the normally dome-shaped cornea gradually thins and bulges outward into a cone-like shape. This structural change distorts light entering the eye, causing increasingly blurred and distorted vision that cannot be fully corrected with standard glasses. The condition typically begins in the teenage years or early twenties and may progress for 10 to 20 years before stabilising.

The prevalence of keratoconus has historically been quoted as approximately 1 in 2,000 people. However, modern corneal imaging technology has revealed that the condition is significantly more common than previously thought — recent studies using corneal topography screening suggest a prevalence closer to 1 in 375 in some populations. Early detection through routine screening is therefore increasingly important.

The earliest signs of keratoconus include frequently changing glasses prescriptions, increasing astigmatism that is difficult to correct with spectacles, ghosting or multiple images (monocular diplopia), and sensitivity to light and glare. As the condition progresses, vision may deteriorate to the point where specialised contact lenses or surgical intervention is required.

Corneal topography — a non-invasive imaging technique that maps the curvature of the corneal surface — is the gold standard for keratoconus diagnosis. At K Vision Centre, Miss Tina Khanam uses advanced Pentacam tomography, which analyses both the front and back surfaces of the cornea and measures corneal thickness at thousands of points. This technology can detect keratoconus at its earliest sub-clinical stage, before symptoms become apparent.

Corneal collagen cross-linking (CXL) has transformed keratoconus management. This procedure uses riboflavin (vitamin B2) eye drops combined with controlled ultraviolet-A light to strengthen the collagen bonds within the cornea, effectively halting or significantly slowing disease progression. Clinical evidence from long-term follow-up studies demonstrates that CXL stabilises the cornea in over 95% of cases, and in many patients, the cornea actually flattens slightly, improving vision.

For patients with established keratoconus where vision cannot be adequately corrected with glasses, specialist contact lenses are the primary visual rehabilitation tool. Rigid gas-permeable (RGP) lenses, scleral lenses, and hybrid lenses can provide excellent vision by creating a smooth optical surface over the irregular cornea. Miss Khanam works closely with specialist contact lens practitioners to ensure optimal lens fitting.

In advanced cases where contact lens wear is no longer tolerable or the cornea has scarred, corneal transplantation (keratoplasty) may be considered. Deep anterior lamellar keratoplasty (DALK) replaces only the affected front layers of the cornea, preserving the patient's own endothelial layer and reducing the risk of rejection compared to full-thickness transplantation.

One crucial message for keratoconus patients: stop rubbing your eyes. Research has established a strong association between chronic eye rubbing and keratoconus progression. Allergic eye disease, which causes itching and the urge to rub, should be actively treated to break this cycle.

If you have been diagnosed with keratoconus or are experiencing symptoms of progressive visual distortion, book a specialist consultation at K Vision Centre. Early intervention with cross-linking can preserve your vision and prevent the need for more invasive treatments later.