Posterior Vitreous Detachment
Another normal mechanism of eye floaters is posterior vitreous detachment or PVD.
Normally there are adhesions between the back surface of the vitreous body and the inner layer of the retina and for some reasons such as old ages, myopia and trauma; these adhesions will be released causing vitreous body to detach from the retina.
Vitreous will collapse inside the posterior segment of the eye and with each eye movement, collapsed vitreous will move, causing eye floaters.
This kind of detachment is normally present in old ages but there are many factors that can cause posterior vitreous detachment at young age such as myopic patient, intraocular inflammation, trauma, cataract surgery, after YAG laser capsulotomy, diabetic retinopathy and vitreous hemorrhage.
Usually it occurs without any complications and only the patients will complain of floaters which usually disappear after few weeks or months.
Sometimes, the vitreous detachment from the retina is incomplete, in which some parts of the vitreous body remain attached to the retina, causing traction on the retina. This traction will be noticed by the patient as flashes of lights or photopsia and with time this traction can lead to retinal breaks or tears and the fluid inside the vitreous body can pass under the retina leding to rhegmatogenous retinal detachment.
Any patient who noticed floaters and/or photopsia for the first time should have complete ocular examination to rule out any incomplete vitreous detachments with traction on the retina.