Cataracts refer to the fogging /clouding of the lens.

Posterior capsular opacification (PCO), also known as 'after-cataract', occurs in about 20-25% of patients after cataract surgery.

A retinal detachment refers to when the retina separates from the retinal pigment epithelium.

A retinal break is usually caused by pulling forced between the vitreous humor gel and the retina.