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Keratoconus is a progressive condition where the cornea gradually thins and bulges into an irregular, cone-like shape, distorting vision. C3R — corneal collagen cross-linking — is the only treatment proven to actually halt that progression, rather than just correcting its symptoms.
The cornea is normally a smooth, evenly curved dome. In keratoconus, the corneal tissue gradually weakens and thins, causing it to bulge outward into an irregular cone shape. This distorts how light focuses onto the retina, leading to blurred and distorted vision, increasing short-sightedness and astigmatism, and glasses prescriptions that seem to keep changing. It typically begins in the teenage years or twenties and can progress over time if untreated — frequent eye rubbing and certain allergic conditions are known to accelerate it.
C3R, also known as CXL, is a procedure that strengthens the cornea's collagen fibres by creating new molecular bonds between them — essentially stiffening the corneal structure so it resists further bulging. Riboflavin (vitamin B2) drops are applied to saturate the cornea, then a controlled dose of UV-A light activates a reaction that cross-links the collagen fibres together. It's the only treatment currently proven to halt keratoconus progression, rather than simply correcting the vision distortion it causes.
C3R works best when performed while keratoconus is still progressing but before significant corneal thinning has occurred — it's a halt-and-preserve treatment, not a reversal. This is why corneal topography is so important: it can detect keratoconus early, often before it's noticeable through routine examination or a standard eye test, and is used to track whether the condition is actively progressing, which is what determines whether and when C3R is recommended.
C3R is typically performed as a day procedure under numbing eye drops. In the standard "epithelium-off" technique, the thin outer layer of the cornea is gently removed to allow the riboflavin to absorb properly, drops are applied for around 20 to 30 minutes, and the cornea is then exposed to UV-A light for a further 20 to 30 minutes. A soft bandage contact lens is placed afterward to protect the eye while the surface heals.
Some discomfort, light sensitivity, watering, and blurred vision are normal for the first three to five days as the corneal surface heals — this is the most demanding part of recovery. Vision continues to stabilise over the following weeks to months. Most patients still need glasses or contact lenses afterward — C3R's goal is to prevent things from getting worse, not to eliminate the need for correction. Specialty contact lenses are often part of managing keratoconus both before and after treatment.
Keratoconus management at Sadbhaav starts with corneal topography to diagnose and track the condition, and often includes specialty contact lens fitting alongside or after C3R. If you've been told LASIK isn't suitable for you due to keratoconus, read more about LASIK candidacy and why this distinction matters. See our full range of diagnostic equipment.
Noticing worsening or unstable vision, or told you may have keratoconus? Book a consultation or message us on WhatsApp.
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