CSR stands for Central Serous Retinopathy. It is a condition in where fluid from the blood vessels behind the retina leaks under the retina and lifts it slightly up. Its typically temporary. And why it happens is unknown.
In almost all cases, it happens in the early adult years and heals spontaneously. It often comes with emotional stress.
CSR poses no risks, unless it doesnt go away. Vision changes even during the active phase of the blister are minimal.
If the condition persists, LASER can seal the small hole in the barrier between the retina and these blood vessels.
Sometimes people think that fluorescein angiography involves an injection in the eye. It doesnt. The dye is injected into a vein. The dye circulates through the blood stream and into the blood vessels of the eyes. Then, a rapid sequence of photographs of the retina is taken to look for the leaking hole. As long as you are not allergic to the dye, this is a safe study.