In its initial stages, the disease causes moderately blurred vision and sensitivity to bright light. As it advances, vision may become twisted. An eye specialist can diagnose keratoconus by using a slit lamp method or by inspecting the surface of the cornea by corneal topography.
Symptoms of keratoconus include:
- Eye strain.
- Distorted vision.
- Light sensitivity.
- Poor night vision.
- Double vision in one eye.
- Noticeably, worse vision in one eye.