What Is Keratoconus?
Keratoconus is a progressive eye condition where the normally round cornea (the clear front part of the eye) thins and gradually bulges outward into a cone shape. This abnormal curvature distorts light as it enters the eye, leading to blurred and distorted vision. The condition often begins in adolescence or early adulthood and may worsen over time if left untreated.
Symptoms & Signs
Keratoconus symptoms usually appear gradually and may include :
- Blurred or distorted vision
- Increased sensitivity to light and glare
- Frequent changes in glass prescription
- Difficulty seeing at night
- Eye strain or headaches
- Double vision (especially in one eye)
- Ghost images or halos around lights
In advanced cases, sudden worsening of vision may occur due to swelling of the cornea (hydrops).
Causes & Risk Factors
The exact cause of keratoconus is not fully understood, but several factors are linked to its development :
- Genetics / family history of keratoconus
- Chronic eye rubbing (common in allergy sufferers)
- Underlying conditions such as Down syndrome, connective tissue disorders, or asthma
- Environmental factors like UV exposure or oxidative stress
Diagnosis & Examination
Accurate diagnosis is made by an eye specialist using advanced tests, including :
- Refraction tests — to check prescription changes
- Slit-lamp examination — to identify corneal thinning and cone shape
- Corneal topography — maps the surface curvature of the cornea and is the most sensitive tool for detecting early keratoconus
- Pachymetry — measures corneal thickness
- OCT imaging — detailed scans of corneal layers
Management Approaches
Keratoconus management depends on the severity and progression of the condition :
Non-Surgical / Early Stage
- Spectacles or soft contact lenses — helpful in early stages to correct mild astigmatism and blurred vision
- Rigid Gas Permeable (RGP) contact lenses — provide clearer vision by reshaping the corneal surface
- Hybrid or scleral lenses — larger lenses that vault over the cornea, offering comfort and improved visual clarity
Advanced Treatment Options
Corneal Cross-Linking (CXL) :
A minimally invasive procedure that strengthens corneal collagen fibers using riboflavin (vitamin B2) drops and controlled UV light. This halts or slows progression of keratoconus and reduces the need for corneal transplantation.
Intracorneal Ring Segments (ICRS) :
Small plastic rings inserted into the cornea to flatten its shape, improve vision, and stabilize progression.
Topography-Guided Photorefractive Keratectomy (PRK) :
In select cases, surface laser treatment can be combined with CXL to improve visual quality.
Corneal Transplant (Keratoplasty) :
In advanced stages with severe corneal scarring or thinning, a partial or full corneal transplant may be necessary to restore vision.
Risks & Complications
If left untreated, keratoconus can result in :
- Severe visual impairment
- Irregular astigmatism that cannot be corrected with glasses
- Corneal scarring
- Sudden corneal hydrops (swelling due to fluid leakage)
- Dependence on advanced contact lenses or surgery for functional vision
Post-Treatment Care & Recovery
- Regular follow-up visits to monitor corneal stability
- Proper care and hygiene of contact lenses
- Use of protective eyewear to avoid eye trauma
- Avoidance of excessive eye rubbing
- Long-term monitoring even after CXL or surgery to ensure vision remains stable
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