Testing eyesight is an important part of maintaining healthy vision and detecting any potential eye problems early on. Here are some of the most common ways to test eyesight:

1. Visual acuity test: This is a basic eye test that measures how well you can see from a distance. You will be asked to read letters on a chart from a distance of 20 feet.
2. Refraction test: This test measures how well your eyes can focus light and can determine if you need glasses or contact lenses. You will be asked to look through a series of lenses to determine the best prescription for your eyes.
3. Tonometry: This test measures the pressure inside your eye and is used to screen for glaucoma, a disease that can cause vision loss if left untreated.
4. Color vision test: This test checks if you have color blindness, a condition where you cannot distinguish between certain colors.
5. Dilated eye exam: During this exam, eye drops are used to dilate your pupils, allowing the doctor to examine the inside of your eye for signs of disease or damage.
6. Visual field test: This test measures your peripheral vision, which can be affected by diseases such as glaucoma.

It is recommended that adults get a comprehensive eye exam every 1-2 years, and children should have their eyes checked regularly as they grow and develop. If you are experiencing vision problems or have a family history of eye disease, it is important to consult an ophthalmologist for a comprehensive eye exam.