Are you noticing that your vision feels a bit off or blurry? Perhaps things don't look as sharp as they used to, or do you see rings of light when looking at lamps or streetlights? While it is not a daily concern for many, there is a specific eye condition you should be aware of: Keratoconus. Though the name might sound complex, let us break down what it is, why it happens, how it is detected, and the treatment options available at Nirogi Lanka.
What Exactly is Keratoconus?
Simply put, Keratoconus is a condition that affects your eye. The clear, rounded, window-like layer at the front of your eye is called the cornea. Its primary job is to protect your eye and help focus light to give you clear vision. Normally, your cornea has a smooth, dome-like shape.
However, with Keratoconus, the cornea begins to thin and bulge outward into a cone-like shape. Think of it as a smooth, rounded surface slowly warping into a sharp, irregular peak.
This condition usually becomes apparent during adolescence or early adulthood, though it can sometimes start in childhood or even be identified later in life. While the corneal shape changes gradually over many years, in younger people, these changes can happen relatively quickly.
How Does Keratoconus Affect Your Vision?
Keratoconus impacts your vision in two main ways:
1. As the cornea distorts into a cone, the surface loses its smoothness and becomes uneven. This is what doctors call irregular astigmatism. Because of this, regular eyeglasses often struggle to provide a clear, corrected image.
2. As the cornea protrudes, your eye becomes increasingly nearsighted (myopia). This often leads to needing more frequent prescription changes for your glasses.
How Common Is This Condition?
Statistically, Keratoconus affects approximately 50 to 200 out of every 100,000 people. It is not extremely common, but it is certainly a condition that warrants clinical attention.
What Are the Symptoms of Keratoconus?
If you have Keratoconus, you may experience the following symptoms:
- Gradual blurring of vision in one or both eyes. Most often, it affects both eyes.
- Double vision when looking with only one eye.
- Seeing halos or glare around bright lights, such as seeing rings around a light bulb.
- Sensitivity to light. Known as photophobia, even moderate lighting might feel uncomfortable or glaring.
- Distorted vision. Straight lines may appear wavy, curved, or bent. For example, looking at a window frame might reveal distorted angles rather than straight lines.
Important: If you notice one or more of these symptoms, please schedule an appointment with an ophthalmologist. Early diagnosis makes management much easier.
What Causes Keratoconus?
The exact cause of Keratoconus remains unknown. However, research suggests that genetics play a role, as it can run in families, and it is also more common in people with certain underlying health conditions.
Generally, Keratoconus is not caused by injury or illness. However, it has been observed that chronic eye rubbing can accelerate the progression of the condition. If you have a habit of rubbing your eyes frequently, it is highly recommended that you stop.
Associated Conditions
Keratoconus is linked to several systemic conditions. People with these issues may have chronic eye irritation or an increased tendency to rub their eyes:
- Skin allergies like atopic dermatitis and allergic dermatitis.
- Nasal allergies or allergic rhinitis.
- Asthma.
- Down syndrome.
- Ehlers-Danlos syndrome.
- Osteogenesis imperfecta (brittle bone disease).
- Congenital eye disorders, such as aniridia.
Potential Complications of Keratoconus
If left untreated, Keratoconus can lead to serious complications:
- Corneal scarring: Scarring on the surface of the cornea can lead to permanent vision loss.
- Corneal hydrops: A sudden swelling of the cornea due to fluid accumulation. This is an emergency situation requiring immediate care.
- Fleischer rings: The deposition of iron within the cornea, appearing as a brownish ring.
- Vision loss: Ranging from mild impairment to severe visual loss.
How Is Keratoconus Diagnosed?
During your consultation, your eye doctor will discuss your symptoms and family history before performing a comprehensive eye exam. They may use several specialized tests:
- Visual acuity test: Using an eye chart to assess vision and utilizing a phoropter to determine the right lens prescription for maximum clarity.
- Slit lamp examination: A specialized microscope and bright light used to inspect the structure of your cornea in detail.
- Keratometry: A measurement of the curvature of the cornea to assess the degree of astigmatism.
- Corneal mapping (tomography and topography): These tests create a detailed 3D "map" of the corneal surface. These are the gold standard for accurately identifying the presence and progression of Keratoconus.
How Is Keratoconus Treated?
Treatment depends on the severity of the condition. Your ophthalmologist will recommend the best path forward for you.
Eyeglasses and contact lenses
In early stages, standard glasses or soft contact lenses may improve vision. However, as the condition progresses and irregular astigmatism worsens, glasses may no longer be sufficient. In such cases, you may require specialized hard (rigid gas-permeable) contact lenses.
Corneal crosslinking
This is a procedure using UV light to slow down or stop the progression of keratoconus. During this treatment, your eye is numbed with drops, and a solution containing riboflavin (vitamin B2) is applied for about 30 minutes. Following this, your eye is exposed to UV light for another 30 minutes. This process strengthens the bonds between the collagen fibers in your cornea, helping to prevent further changes in its shape.
Implantable ring segments (INTACS)
"INTACS" are tiny, ring-shaped devices implanted into your cornea. These can help improve your vision or make wearing contact lenses more comfortable. This procedure is also performed under local anesthesia using numbing drops. Your doctor creates small channels in the cornea to insert these rings. The rings then flatten the cornea, helping to correct its cone-like shape to some extent.
Cornea transplant
If your keratoconus is very advanced, your doctor may suggest a cornea transplant. In this procedure, your diseased cornea is replaced with healthy donor tissue from a deceased donor. While vision generally improves after a transplant, it can take over a year for your vision to stabilize. Some people may still need specialized contact lenses to achieve their best possible vision after the procedure.
Are there side effects or complications with these treatments?
Like any medical procedure, there are potential risks associated with keratoconus treatments.
- Potential risks of Corneal cross-linking:
- Eye pain or irritation
- Dry eyes
- Worsening of keratoconus
- Infections
- Potential risks of INTACS:
- Infections
- Glare or seeing halos around lights
- Corneal thinning
- Potential risks associated with cornea transplant:
- Cornea graft rejection
- Infections
- Glaucoma
Complications from glasses or contact lenses are extremely rare. However, if you notice your eyes becoming red or experience any discomfort, please consult your doctor.
How long does recovery take after treatment?
Recovery time depends on the type of treatment you receive. Some procedures allow you to recover in a few days, while others may take significantly longer.
Can keratoconus be prevented?
Unfortunately, there is no way to prevent keratoconus. However, if you have any of the associated conditions we discussed earlier, avoiding excessive eye rubbing may help reduce your risk.
What happens if I have keratoconus?
With appropriate treatment, you can lead a fulfilling life while managing keratoconus.
If your vision differs significantly between your two eyes, you may experience issues with balance. Please discuss this with your doctor, and they will work with you to find a solution.
Everyone is different. Some people have mild keratoconus that does not progress, while others experience a gradual worsening. It is impossible to predict exactly how the condition will develop for any individual.
Can keratoconus lead to vision loss?
If left untreated, keratoconus can lead to permanent vision loss. Because of the changes in the cornea, it becomes difficult to focus properly, even with glasses or standard soft contact lenses.
Furthermore, if you are considering laser vision correction surgery, such as LASIK, please be aware that having keratoconus can be dangerous, as the surgery may cause the condition to deteriorate further. If you are considering such surgery, your ophthalmologist will assess your candidacy. If you have even mild keratoconus, do not undergo LASIK unless specifically recommended by your doctor.
When should I see my doctor?
If you notice any changes in your vision, always consult your ophthalmologist. If you have keratoconus, you will need frequent check-ups; do not miss these appointments.
When should I go to an emergency department?
Go to the nearest emergency department immediately if:
- You experience a sudden loss of vision.
- You suffer from severe eye pain.
- You have recently had an eye procedure (e.g., surgery) and now show signs of infection, such as fever or pus discharge from the eye.
What questions should I ask my doctor about keratoconus?
You may consider asking your doctor the following:
- Do you believe there is a genetic basis for my condition?
- Should I undergo any genetic testing?
- Am I a candidate for any clinical trials?
- How often should I have my eyes examined?
- What symptoms should I consider an emergency?
- Are you aware of any support groups for people with keratoconus?
Can someone with keratoconus lead a normal life?
Yes, absolutely. While keratoconus may affect your vision, it should not stop you from living a satisfying life.
Is someone with keratoconus considered legally blind?
Generally, having keratoconus does not mean you are legally blind. However, if you have very advanced keratoconus, your vision loss may reach the threshold defined for legal blindness.
Finally, remember… (Take-Home Message)
Receiving a diagnosis like keratoconus can be difficult, but your ophthalmologist is there to support you. Treatments for keratoconus exist, and your doctor will work closely with you to find the approach best suited for your needs. Knowledge is your best friend. Feel free to ask questions, discuss your concerns, and talk openly about what you need to live your best life. Stay calm, and follow your doctor's medical advice diligently. Nirogi Lanka is with you on your journey to wellness.
