If you’re in your 20s or 30s and your glasses prescription keeps changing, or your vision just doesn’t feel as sharp as it should even with correction, it’s worth knowing about keratoconus, a condition that typically starts exactly in this age range and is far easier to manage the earlier it’s caught.
What Keratoconus Actually Is
Keratoconus is a progressive thinning of the cornea, which causes it to gradually bulge into an irregular, cone-like shape instead of staying smoothly curved. This distorts how light enters the eye, leading to blurred and distorted vision that glasses often can’t fully correct.
Why Your 20s and 30s Specifically
Keratoconus most commonly begins in the teenage years and continues to develop through the 20s and into the 30s, often stabilising later in life. This makes early adulthood the critical window, both for developing symptoms and for catching them before significant progression occurs.
Early Warning Signs
- Frequent changes to your glasses or contact lens prescription — more often than the gradual shifts typical of normal ageing
- Blurred or distorted vision that glasses don’t fully correct, even with an updated prescription
- Increased sensitivity to light and glare, particularly at night
- Difficulty with night driving, including halos around headlights
- Eye strain or frequent squinting to try to bring things into focus
- A habit of rubbing your eyes frequently — this is both a risk factor and sometimes an early symptom, and aggressive eye rubbing can actually accelerate progression
Why Catching It Early Matters
Keratoconus is progressive, meaning it typically continues to change the shape of the cornea over time if untreated. Caught early, treatments like corneal cross-linking can help stabilise the cornea and slow or halt progression. Caught late, options become more limited, and more significant intervention may be needed to restore functional vision.
It’s Not Always Obvious
Because the changes happen gradually, many people attribute early keratoconus symptoms to “just needing new glasses” for months or years before an eye specialist identifies the real cause. If your prescription has changed more than once in the past year, or your vision doesn’t feel as sharp as your last eye test suggested it should be, that’s worth flagging rather than dismissing.
What an Assessment Involves
Diagnosing keratoconus typically involves corneal topography, a quick, painless scan that maps the surface curvature of your cornea in detail, picking up on irregularities long before they’d be obvious through a standard vision test alone.
Noticed any of these signs? A corneal assessment can tell you definitively whether it’s keratoconus, and if it is, the earlier you know, the more options you have.
