There are several different tests that can be performed to assess visual acuity, or the sharpness of your vision. Here are some of the most common tests:

1. Snellen eye chart: This is the classic eye chart that most people are familiar with. It consists of rows of letters of varying sizes, and you are asked to read the smallest letters that you can see from a distance of 20 feet.
2. Tumbling E chart: This chart is similar to the Snellen chart, but instead of letters, it uses the letter E in different orientations.
3. Random letter chart: This type of chart uses random letters instead of the traditional E or Snellen chart.
4. Computerized vision testing: This type of test uses a computer program to display letters or images on a screen, and you respond to prompts with a handheld remote.
5. Autorefractor: This instrument measures the refractive error of the eye by bouncing a beam of light off the retina and measuring the angle of refraction.
6. Cover test: This test is used to assess eye alignment and binocular vision. You are asked to focus on an object while the doctor covers one eye at a time to see how the uncovered eye responds.
7. Visual field test: This test measures your peripheral vision and can help detect conditions such as glaucoma.

These are just a few examples of the many tests that can be performed to assess your vision. The specific tests that are used will depend on your individual needs and the reason for your exam. It is important to have regular eye exams to maintain good eye health and detect any potential vision problems early on.