Have you started noticing more glare from headlights at night? Does your glasses prescription seem to change again and again? Or does your vision look slightly distorted, even with your usual lenses?
Those symptoms can happen for many reasons. Keratoconus is one possibility.
NBA star Stephen Curry has recently spoken publicly about living with keratoconus, a condition that affects the clear front surface of the eye. A September 2026 report said Curry was diagnosed after former Golden State Warriors general manager Bob Myers noticed him squinting during a game and urged him to have his eyes checked. Curry has since discussed the condition and its effect on his vision.
That has left many people asking a very personal question: could a change in my own vision be an early sign?
What exactly is keratoconus?
Keratoconus affects the cornea, the transparent layer at the front of the eye that helps focus incoming light.
With keratoconus, the cornea becomes thinner in certain areas and gradually changes shape. Instead of keeping a smooth, rounded curve, it can become steeper and bulge outward. The result can be blurred, distorted, or unstable vision.
The condition often starts during the teenage years or young adulthood. It can affect both eyes, but one eye may be more affected than the other.
This is where keratoconus symptoms can become easy to miss. A person may simply think they need stronger glasses.
What are the early signs of keratoconus?
The early signs of keratoconus are often linked to changes in how clearly and consistently you see.
1. Your glasses prescription keeps changing
Do you feel as though your prescription never stays stable?
Frequent changes in glasses or contact-lens prescriptions can occur with keratoconus. A new prescription may improve vision for a period, then seem less effective later.
2. Astigmatism becomes harder to correct
Astigmatism means the eye does not focus light evenly, which can make objects appear blurred or stretched.
Keratoconus can produce irregular astigmatism. Standard glasses may improve vision, yet the correction may become less satisfactory as the corneal shape changes.
That pattern is one reason changing astigmatism deserves attention among keratoconus symptoms.
3. Night driving becomes uncomfortable
Bright headlights can produce glare, halos, or streaks.
Night-time visual problems have several possible causes, so they do not prove keratoconus. A person with keratoconus may report increasing trouble with glare or light sensitivity as the corneal surface becomes more irregular.
4. Vision stays blurry even after a new prescription
A fresh pair of glasses should improve ordinary refractive errors.
If vision remains blurry or distorted despite repeated prescription changes, an eye specialist may look for corneal abnormalities. Persistent difficulty correcting vision is among the clinical features doctors assess when checking for keratoconus.
These four early signs of keratoconus do not confirm the condition. They simply give you a reason to ask whether the cornea needs a closer examination.
What are the other keratoconus symptoms?
Common keratoconus symptoms include blurry vision, nearsightedness, astigmatism, double vision, and sensitivity to light. Itchy eyes can occur too. More advanced disease can bring greater visual loss, pain, or corneal scarring.
One feature deserves special attention: vision may feel different from one eye to the other.
A person can have mild disease in one eye and more noticeable changes in the other. That can make the condition harder to notice during ordinary daily activities.
How do doctors diagnose it?
A routine eye examination is the starting point, but suspected keratoconus may need more detailed corneal testing.
Doctors can examine the cornea with a slit lamp, a microscope used during an eye examination. Corneal topography and tomography create detailed maps of the corneal surface and shape. These tests can detect abnormal steepening and thinning that may be missed by a basic glasses prescription check.
This matters for people searching for keratoconus symptoms online. Symptoms can raise suspicion. Imaging helps confirm what is happening.
Can keratoconus be treated?
Yes. Treatment depends on how much the cornea has changed and whether the disease is progressing.
Glasses may work in mild cases. Some people need specialty contact lenses, including rigid gas-permeable or scleral lenses, to improve the way light passes through an irregular cornea.
Then there is corneal cross-linking.
Cross-linking is a procedure that uses riboflavin and ultraviolet-A light to strengthen corneal tissue. Its main role is to slow or stop progression in suitable cases. It does not simply function as a stronger version of glasses.
Advanced disease can require surgery, including corneal transplantation in selected patients.
What Curry’s diagnosis can teach people about their own vision
The most useful part of Curry’s story is not the celebrity angle. It reminds us that visual changes can be easy to normalise.
According to the American Academy of Ophthalmology, keratoconus can involve frequent prescription changes, reduced vision that glasses don’t correct well, abnormal astigmatism, and changes in corneal shape.
That makes the early signs of keratoconus worth discussing with an eye-care professional when they persist or keep changing.
Curry’s experience does not mean every person with night glare or astigmatism has the same disease. Cataracts, dry eye, ordinary refractive errors, and other eye conditions can cause similar complaints.
The useful question is simple: has your vision changed enough that you need another eye examination?
FAQs
Can keratoconus cause sudden vision loss?
Keratoconus usually develops over time. A sudden major drop in vision, severe eye pain, or marked light sensitivity needs prompt medical assessment, since acute corneal problems can occur and may need urgent care.
Can rubbing your eyes make keratoconus worse?
Frequent vigorous eye rubbing is associated with keratoconus and is taken seriously in clinical care. People with persistent itching should discuss ways to control the irritation rather than repeatedly rubbing their eyes.
Are early signs of keratoconus always obvious?
No. Early disease can produce subtle changes, such as prescription instability or mild distortion. Some people may have few noticeable symptoms before corneal imaging shows an abnormal pattern.
Can glasses correct keratoconus?
Glasses can improve vision in milder disease. As the cornea becomes more irregular, specialty contact lenses may provide clearer vision than ordinary glasses.
Does keratoconus always get worse?
The course varies from person to person. Some cases remain stable for long periods, and progression can occur at different rates. Regular monitoring helps doctors detect meaningful changes.
What should I do if I have several keratoconus symptoms?
Book a comprehensive eye examination, especially if your prescription keeps changing or your vision remains distorted after correction. A clinician can decide whether corneal topography or tomography is needed.
