Keratoconus is a bilateral, non inflammatory degeneration, axial ectatic condition of cornea. ie. cornea has a irregular conical shape. This causes progressive decrease in quality & quantity of vision. Exact cause is not clear.
Genetic factors in less than 10% cases.
Environmental factors increasingly suspected UV light, allergies, mechanical eye rubbing & poorly fitted contact lenses.
Keratoconus may be associated with other eye conditions and systemic disorders.
Ocular associations Systemic disorders
Vernal disease Down’s syndrome
Retinitis pigmentosa Turner’s syndrome
Blue sclera Marfan’s syndrome
Aniridia Prolapsed mitral valve
Ectopia lentis Osteogenesis imperfecta
Keratoconus may remain subclinical or completely uninvolved in the fellow eye in only 6% of cases.
LASIK should not be done in these cases.
Keratoconus can be managed with collagen cross linking. In advanced cases corneal grafting is the only alternative.
Attention Contact Lens Users: Risky Behaviour Patterns
- Sleeping overnight with contact lens on.
- Napping with contact lenses
- Topping up the disinfectant solution in the case.
- Extending the recommended replacement frequency of contact lens or cases.
- Showering with lenses on.
- Swimming with lenses on.
- Rinsing contact lens in tap water.
- Storing contact lenses in tap water.
- Ignoring treatment of eyelid diseases.