Original Article: http://www.mayoclinic.com/health/medical/IM02815
- Slide show: Age-related vision problems
As you age, the vitreous — a jelly-like material inside your eyes — becomes more liquid. When this happens, microscopic collagen fibers within the vitreous tend to clump together. These bits of debris cast tiny shadows onto your retina, and you perceive these shadows as eye floaters.