Have you heard of keratoconus? And if you have — do you know what causes it, what it feels like, and how it's treated? This article walks through all of that and more.
What Is Keratoconus?
Before defining keratoconus, it helps to know what the cornea actually is.
The cornea is the clear, dome-shaped tissue at the front of the eye — five layers separated by two membranes. Its job is to bend light before it enters the eye. It contains no blood vessels at all, drawing oxygen directly from the surrounding air, since it sits on the outermost surface of the eye.
Keratoconus is a progressive condition in which the fine collagen fibres that hold the cornea in shape gradually weaken. The cornea can no longer keep its normal curvature. It bulges forward instead, taking on a cone-like profile.
The image below shows the difference between a normal cornea and a keratoconic one.
💙 A note from Dr. Ahmed Shaarawy's team
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When Do Keratoconus Symptoms Appear?
Most often in the late teens. From there the condition tends to progress over the following 10 to 20 years, particularly as declining visual clarity. Less commonly, it can show up in early childhood — or as late as the 30s and 40s.
Symptoms of Keratoconus
Keratoconus changes vision in two main ways.
First, as the cornea shifts from a smooth dome to a cone, its surface becomes irregular — what doctors call irregular astigmatism.
Second, as the cornea steepens, the eye becomes more myopic. Distant objects blur while close objects may stay relatively clear.
Other symptoms show up too, such as:
- Gradual loss of vision in one or both eyes, often in the late teens.
- Double vision in a single eye, even with glasses on.
- Halos around bright lights.
- Light sensitivity that makes night driving difficult.
- Visible scarring, swelling, or redness of the eye.
- Sudden changes in vision in one or both eyes.
That said, these symptoms overlap with many other eye conditions — an in-person evaluation is the only way to reach an accurate diagnosis.
Why Patients Choose Dr. Ahmed Shaarawy for Keratoconus Care in Egypt
Dr. Ahmed Shaarawy is a lecturer and consultant in corneal and refractive surgery at the Research Institute of Ophthalmology. He completed his PhD and a corneal fellowship at the Devers Eye Institute in Oregon, USA, training under leading American corneal surgeons, and was the first surgeon in Egypt to perform posterior lamellar corneal transplantation using the s-stamp technique.
He has since helped train many ophthalmologists in this approach and has presented his work at conferences across the United States and the Arab world. That track record, together with his use of the most current corneal techniques, has made him a leading voice in Egyptian ophthalmology.
What Causes Keratoconus?
Honestly, no one fully knows yet. Researchers believe some patients are simply born with a predisposition.
Several factors are thought to contribute:
Family history: If a relative has keratoconus, your own risk is higher. If you carry the diagnosis yourself, your children should start having eye exams around age 10.
Age: The condition typically begins in the teenage years, though it can appear in childhood or be diagnosed as late as the 30s and beyond — less common, but it happens.
Certain systemic conditions: Studies have linked keratoconus to Down syndrome, Ehlers-Danlos syndrome, osteogenesis imperfecta, and retinitis pigmentosa.
Inflammation: Chronic inflammation from allergies, asthma, or eye disease can weaken corneal tissue.
Eye rubbing: Persistent vigorous rubbing weakens corneal collagen and can speed up progression in patients who already have the disease.
Ethnicity: A study of more than 16,000 patients found keratoconus is more prevalent in the Middle East and Arab countries than in many other regions.
Treatment Options for Keratoconus
Treatment is matched to how far the disease has progressed and the symptoms it produces:
- Specially fitted glasses with thicker prescription lenses for mild cases.
- Targeted treatments such as corneal cross-linking (CXL) and corneal transplantation.
- Intracorneal ring segments (ICRS) placed within the cornea to flatten the cone and improve vision.
- Allergy or anti-inflammatory medications to calm itching when associated allergies are present.
Your treating ophthalmologist will decide which option fits your case. If any of the symptoms above sound familiar, book an evaluation as soon as possible.
