Keratoconus Treatment in Ranchi
Comprehensive keratoconus care including collagen cross-linking and advanced contact lens fitting by Dr. Dibya Prabha, MS, FICO, Retina Fellow at Neurovision Clinic.
What is Keratoconus?
Keratoconus is a progressive, bilateral (though often asymmetric) corneal ectatic disorder in which the cornea thins and assumes a conical shape, resulting in irregular astigmatism and visual distortion. The pathogenesis involves genetic predisposition, biomechanical corneal instability, and enzymatic degradation of stromal collagen by matrix metalloproteinases with reduced tissue inhibitors (TIMPs). Histologically, it features fragmentation of Bowman's layer, stromal thinning, and iron deposition in the basal epithelium (Fleischer ring). Fine vertical striae in the deep stroma (Vogt's striae) are pathognomonic, while acute hydrops occurs when Descemet's membrane ruptures, allowing aqueous to enter the stroma. The condition typically presents in the second decade of life and may progress for 10–20 years before stabilizing. At Neurovision Clinic in Ranchi, Dr. Dibya Prabha provides comprehensive keratoconus care from early detection through corneal topography to advanced management. She educates patients that eye rubbing is the strongest modifiable risk factor, and that atopic conditions such as vernal keratoconjunctivitis increase susceptibility.
Symptoms of Keratoconus
- •Progressive blurring and distortion of vision that is not fully correctable with spectacles
- •Multiple ghost images or monocular diplopia, particularly noticeable with high-contrast targets like text
- •Frequent changes in spectacle prescription due to evolving irregular astigmatism
- •Increased sensitivity to glare and halos around lights, especially during night driving
- •Eye rubbing — often a preceding and exacerbating factor, particularly in patients with atopy
- •Munson's sign: a V-shaped indentation of the lower eyelid on downgaze from the protruding cone
- •Rizutti's sign: a conical light reflex on the nasal cornea when illuminated from the temporal side
Causes & Risk Factors
- •Genetic predisposition: family history positive in 6–10% of cases with possible autosomal dominant inheritance with variable expressivity
- •Chronic eye rubbing — the strongest modifiable risk factor — mechanically traumatizes the corneal epithelium and stroma
- •Atopic disease: vernal keratoconjunctivitis, atopic dermatitis, and allergic rhinitis associated with increased eye rubbing
- •Collagen disorders: connective tissue diseases including Ehlers-Danlos syndrome, osteogenesis imperfecta, and Marfan syndrome
- •Down syndrome (trisomy 21): keratoconus prevalence up to 10–15 times higher than the general population
- •Oxidative stress and reduced antioxidant defenses in the corneal stroma leading to keratocyte apoptosis
- •Hormonal influences: onset at puberty and possible progression during pregnancy suggesting endocrine factors
Diagnostic Tests
Corneal Topography and Tomography
Corneal topography is the gold standard for keratoconus diagnosis and monitoring. Dr. Dibya Prabha uses Placido-disc based topography and Scheimpflug tomography (Pentacam) to generate detailed anterior and posterior corneal elevation maps, corneal pachymetry maps, and keratometry readings. Diagnostic indices include inferior-superior asymmetry, skewed radial axes, and elevated posterior corneal elevation values. The Belin/Ambrósio Enhanced Ectasia Display on Pentacam provides objective parameters for detecting subclinical or forme fruste keratoconus before clinical signs appear.
Anterior Segment OCT and Pachymetry
Anterior segment optical coherence tomography (AS-OCT) provides high-resolution cross-sectional imaging of the cornea, enabling Dr. Prabha to measure epithelial thickness profiles and detect focal thinning characteristic of early keratoconus. Central and thinnest-point pachymetry values are critical for determining CXL candidacy — a minimum stromal thickness of 400 microns (post-epithelial removal) is required for safe UVA irradiation without endothelial damage.
Treatment Approach
Dr. Dibya Prabha at Neurovision Clinic provides a staged, evidence-based management plan for keratoconus patients. The dual goals are to halt disease progression in eligible candidates and to optimize visual function through specialized optical correction.
Corneal Collagen Cross-Linking (CXL)
For patients with documented progression, Dr. Prabha recommends epithelium-off CXL using the Dresden protocol, which strengthens the corneal stroma and halts ectasia in over 95% of cases. The procedure involves epithelial debridement, riboflavin 0.1% saturation for 30 minutes, and UVA irradiation at 3 mW/cm² for 30 minutes. Emerging accelerated CXL protocols using higher irradiance for shorter durations may also be considered to reduce treatment time and patient discomfort.
Specialty Contact Lens Fitting
Vision correction in keratoconus often requires rigid gas permeable (RGP) lenses including Rose-K and other aspheric designs, or scleral lenses that vault the entire cornea. Dr. Prabha fits scleral lenses using anterior segment OCT to ensure adequate corneal clearance (250–300 microns) while maintaining appropriate limbal and scleral landing zone fit. Scleral lenses are particularly beneficial for patients with advanced cones, RGP intolerance, or post-CXL irregularity, providing excellent visual quality and all-day comfort.
INTACS and Combination Procedures
For select patients with contact lens intolerance and clear central corneas, intracorneal ring segments (INTACS) may be considered. These crescent-shaped PMMA segments are surgically inserted into the mid-peripheral corneal stroma through a femtosecond laser-created tunnel, flattening the central cornea and reducing irregular astigmatism. Dr. Prabha counsels that INTACS improve contact lens fitting and spectacle-corrected vision but do not halt progression — they may be combined with CXL for comprehensive management.
⚠️ When to See a Doctor
- !Progressive deterioration in vision quality despite frequent spectacle prescription changes
- !Significant ghost imaging, monocular diplopia, or distortion that affects reading or driving
- !Inability to achieve acceptable vision with glasses, suggesting irregular astigmatism
- !Family history of keratoconus in first-degree relatives warranting screening topography
- !History of chronic eye rubbing or atopic disease with any visual symptoms