<unk>  can sometimes be prevented. The most effective means is by educating people to seek ophthalmic medical attention if they suffer symptoms suggestive of a posterior vitreous<unk> . Early examination allows detection of<unk>  tears which can be treated with laser or cryotherapy. This reduces the risk of<unk>  in those who have tears from around 1:3 to 1:20. There are some known risk factors for<unk> . There are also many activities which at one time or another have been forbidden to those at risk of<unk> , with varying degrees of evidence supporting the restrictions. Cataract surgery is a major cause, and can result in<unk>  even a long time after the operation. The risk is increased if there are complications during cataract surgery, but remains even in apparently uncomplicated surgery. The increasing rates of cataract surgery, and decreasing age at cataract surgery, inevitably lead to an increased incidence of<unk> . Trauma is a less frequent cause. Activities which can cause direct trauma to the eye (boxing, kickboxing, karate, etc.) may cause a particular type of<unk>  tear called a<unk>  dialysis. This type of tear can be detected and treated before it develops into a<unk> . For this reason governing bodies in some of these sports require regular eye examination. Individuals prone to<unk>  due to a high level of myopia are encouraged to avoid activities where there is a risk of shock to the head or eyes, although without direct trauma to the eye the evidence base for this may be unconvincing. Some doctors recommend avoiding activities that suddenly accelerate or decelerate the eye, including bungee jumping and skydiving but with little supporting evidence.<unk>  does not occur as a result of eye strain, bending, or heavy lifting.
Retinal detachment
Retinal haemorrhage
Intraocular hemorrhage
Optic neuritis
Vitreoretinopathy
Ischemic optic neuropathy
Anterior ischemic optic neuropathy
Posterior ischemic optic neuropathy