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The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
The bottom line: If you are noticing a big change in your vision, you should see a doctor to find out what's going on. Your eyeball is slightly smaller than a gumball. A gumball you'd get from a grocery store gumball machine gumball is about 27 to 28 millimeters wide. The average human eyeball is 24 millimeters wide.