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There are many pathological causes in the vitreous that lead to floaters.
Eye Floaters can also be caused by abnormal deposits in the vitreous which can be white blood cells, red blood cells, drug remnants, parts of the cataract and retinal flaps.
1- White Blood Cells.
Which can occur after intra-ocular inflammation which is called uveitis. Many systemic and ocular diseases can cause uveitis and the most common are: sarcoidosis, multiple sclerosis, Behçet diseases, leukemia and intra-ocular infections like syphilis, toxoplasmosis, tuberculosis and CMV retinitis.
2- Red Blood Cells.
Remnants of red blood cells can present after vitreous haemorrhage is resolved. Common causes of vitreous haemorrhage are: diabetic retinopathy, retinal vessels occlusions, trauma, wet AMD with CNV and retinal detachment with tearing to retinal blood vessels.
3- After Cataract Surgery.
One of the complications of cataract surgery is rupture of the posterior capsule in which parts of the cataract can access to the back of the eye and settle in the vitreous.
4- Drug Remnants.
Which can occur after cataract surgery with rupture of the posterior capsule or can occur with intra-ocular injections of steroid or Anti-VEGF drugs like Avastin and Lucentis.
Those injections are mainly use to treat wet AMD and diabetic retinopathy
5- Retinal Flap.
With incomplete posterior vitreous detachment, there might be retinal traction. Sometimes with this traction a retinal flap will occur and this part of the retina will settle in the vitreous.
6- After Vitrectomy Surgery.
you eye doctor will remove the vitreous in vitrectomy and replace it either with gas, air or silicon oil.
Remnants of gas bubbles inside your eye will give the perception of floater. Also after the removal of silicon oil from your eye, oils droplets can still remain in the vitreous and give the perception of floaters.
7- After YAG Laser Capsulotomy.
After cataract surgery with intra-ocular lens insertion, the back surface of the lens and the posterior capsule can be opacified or fibrosed causing blurred vision. With YAG laser capsulotomy, this opacification will be released and parts of it will be settled in the vitreous for a while. With time, these parts with be absorbed.
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