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Does this grey spot track and get it the way of what you are exactly looking at, like a rifle sight, or does it kinda float around as you move your eye?
I guess you are offline.
If the small grey spot you are talking about is like the latter of the two choices above, you are most likely suffering from a posterior vitreous detachment.
You have a thick gel material in the middle of your eyes called the vitreous. Over time as it liquefies, this gel material collapses on itself, forms little clumps that you can see as dots, lines or bugs. As these clumps form the vitreous pulls away from the wall of the eye. In the process it can stimulate the retina -- causing the flashes that you see. It is recommended that you see your ophthalmologist to look at the retina to make sure there are no problems such as a retinal hole or tear. In most cases, there are no problems, but this exam is precautionary and allows for preventative treatment of any lesions that are found. If you notice a sudden increase in floaters, flashes of light (like a lightning storm), or a shadow/veil in the periphery of your vision, this can be worrisome for a retinal detachment. You would need to contact your ophthalmologist promptly in that case.
A small PVD could be missed on an eye examination if the doctor was not specifically looking for it. While it is most likely not related to your car accident violent movement of you head during the crash could have, theoretically, helped a PVD to occur.
If you grey spot is more like a rifle sight, blocking everything you directly look at, then there may be a problem with your macula -- the very important part of your retina used for most important daily visual functions. If this is the case I would suggest you return to your ophthalmologist for a repeat exam.
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