The effects of ageing on the eyes. As age increases, the lens thickens and hardens, leading to protein aggregation and clouding, which causes cataracts. The ciliary zonules weaken, the retina degenerates along with optic nerve cells, and retinal blood vessels may sclerose. Additionally, the vitreous becomes cloudy, and intraocular pressure rises. Ageing deteriorates both the structure and function of the eye, heightening susceptibility to various eye diseases.