It sounds like you might be describing what's commonly known as "floaters" or vitreous floaters. These are tiny clumps of gel or cells inside the vitreous, the clear gel-like substance that fills your eye. As light passes through your eye, these floaters cast shadows on your retina, creating the appearance of small dots, lines, or cloud-like shapes that move as your eyes move. They are often more noticeable when looking at something bright, like the sky or a white wall.

Floaters are usually harmless and more common as people age. However, if you're seeing a sudden increase in floaters, especially accompanied by flashes of light or loss of peripheral vision, it could be a sign of a more serious condition like a retinal detachment. Even though your retina doctor mentioned dry eyes, if you're still concerned or the symptoms persist or worsen, it might be worth seeking a second opinion or asking your doctor to re-evaluate the situation.