I have seen two kinds of explanations given for the phenomenon that I try to draw in the attached png document. One explanation says that an air bubble creates the experience of a solid black circle at the bottom of the visual field. This might occur when an injection of medication such as Avastin is given that happens to have had some air in the syringe. The other explanation that I have seen says that silicon lubricant intended to facilitate movement of the plunger in the manufacturer-provided syringe flowed into the medication, so there is a bubble, not of air but of some fluid. (Avastin obstructions are described in many places on the Internet, but I'm trying to understabnd a different injectable medication I received,)
I have tried to experimentally produce shadows of air in test tubes, and such bubbles create shadows that are hollow circles.[ EDIT: My experiment was inadequate if, as I believe, the smaller the bubble of air the darker and more equally dense the shadow will be from side to side,] The fact that the circular obstruction in the visual field is not completely opaque and permits reading of text on a field that is dark but not black or opaque, and the fact that the letters of the text are distinct and not distorted, makes me think that whatever was introduced into the eye (and gradually decreased in volume over the next 24-36 hours) may well have been a foreign fluid. Whatever it is appears at the very bottom of my visual field, no matter how I have positioned my head, so I conclude that it must be a single globule that floats at the top of the normal fluid in the eye.
I'm waiting for some test tubes to try working with various oils. Thanks for any insights that researchers with expertise in this area may be able to provide.
This bubble is the drug that is injected it’s a good sign for the patient and doctors to get sure that the drug i inserted in the vitreous not in other place.
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