What you are describing is a floater. You have a thick gel material in the middle of your eyes. Over time, it liquifies and can sometimes clump together. When you look in the light, you can somtimes see the shadows of these things. Floaters are generally not a problem, though they can be annoying.
Sometimes new floaters can be an indication of a retinal problem, such as a retinal hole or tear. It is recommended you have have a full dilated eye exam to check for any problems with your ophthalmologist
If you notice a sudden increase in floaters, flashes of light
(like a lightening 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.
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Disclaimer: Information provided is for educational purposes only and does not establish a patient-physician relationship nor substitute for a personal consultation with a physician.