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Your husband is likely experiencing a PVD or posterior vitreous detachment, a common event that happens in many people. 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 your husband may see. It is recommended that he see his 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 your husband notices a sudden increase in floaters, flashes of light (like a lightning storm), or a shadow/veil in the periphery of his vision, this can be worrisome for a retinal detachment. He would need to contact his ophthalmologist promptly in that case.
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