Phase 1 · Understand the Body — Why the disease behaves the way it does.
The One-Line Truth
The whole disease in one chain
Everything on this page exists to explain this line.
The clear lens of the eye slowly turns cloudy, making vision hazy and dim.
Car windshield turning foggy
Imagine your car's windshield starts getting a thin layer of cloudy coating on it over years—like dust, salt spray, and oxidation gradually building up. The windshield is like your lens: it's meant to let light (from the road and oncoming cars) pass straight through so you see clearly. But when proteins inside the glass clump together and turn opaque (like the coating), light scatters instead of going straight through, so your view becomes hazy and dim. You can compensate by turning on your headlights brighter (pupil dilates) or cracking the window to look sideways (squinting), but these tricks only work so long. Eventually the coating gets so thick that no amount of brightness helps—you need to replace the windshield (surgery) to drive safely again.
American Academy of Ophthalmology (AAO) Preferred Practice Pattern · National Eye Institute (NEI) · Cochrane Eyes and Vision · American Optometric Association (AOA) · reviewed 2026-07-09