Causes of retina detachment?

Many possible causes: As we age, the vitreous may pull away from its attachment to the retina at the back of the eye. If the vitreous pulls hard enough to tear the retina in one or more places, fluid may pass through, lifting the retina off the back of the eye, causing it to detach. Some risk factors for detachment are: nearsightedness, trauma to the eye or a family history of retinal detachment.

That's correct above. Most commonly retinal detachments originate with a tear in the retina (rhegmatogenous detachment). However, retinas can detach without a tear. This would include inflammation (serous detachment) and scarring/fibrovascular proliferation (traction detachment, most commonly diabetic