Cataract formation inside the eye lens. Cataract formation happens when the normally clear lens inside the eye slowly becomes cloudy. The lens is made of tightly arranged proteins that stay transparent so light can pass through easily. Over time these proteins can begin to clump together which creates soft cloudy areas inside the lens. This cloudiness starts small and usually does not affect vision at first but it gradually spreads as more proteins stick together. As the clouding grows the lens loses its clarity and light can no longer travel through it smoothly. This causes blurry vision, faded colors, and increased sensitivity to bright light. Many people also notice that it becomes harder to see clearly at night. The process usually develops slowly and is often related to aging, though factors like diabetes, smoking, and long term sunlight exposure can speed it up. Inside the eye the change is completely painless. The lens does not have nerves so people only notice the effects on vision. Cataracts are most commonly treated with surgery in which the cloudy lens is removed and replaced with a clear artificial one. After surgery light can travel through the eye normally again which restores clear and sharp vision. - @doctor.asky