A vision screening is a less in-depth screening of your vision, similar to the test you receive at the DMV where you may look into a machine and read the line you can see clearly. A vision screening tells you what your vision is, but generally does not detect anything that may be happening inside of your eye.  An eye exam is done by an Optometrist or Opthamologist with specialized training and uses specialized equipment to detect refractive errors or treat vision concerns.