The eye lens is a protein in the human body and is normally transparent. If too many toxins and free radicals build up in the eye they will oxidize the lens protein and make it cloudy and become opaque, which is the denaturation of the protein, the root cause of cataract formation. We know that egg white protein is transparent, but once it is heated, the protein denatures and becomes solid, which also becomes opaque. We can clearly see the outdoor scenery through the transparent glass window, once the glass is polished to make it called gross glass, the outside scenery is not visible, and this change is also very similar to the process of the lens having transparency into opacity.