This device that you see in the eye doctor's office is called a phoropter.
It's filled with lots of different powers, prescriptions, and lenses so that doctors can ask you the question, "Which is better, number one or number two?" to figure out which one you prefer.
This helps determine your glasses and contact lens prescription. It's filled with many types of lenses so we can figure out not only what type of prescription you need but also if you need prism in your glasses, if you have astigmatism, or any issues with eye alignment.
So, this is a really amazing piece of equipment that eye doctors really cannot live without.
It's one of the main tools we use day to day to help patients see better and get a very accurate glasses and contact lens prescription.
