In some states, you need a license in order to practice opticianry.

Some state licensure requirements include an apprenticeship. Choosing a program that includes a practicum would be a good way to both take care of this requirement and prepare for the examination.

Many states that require licensing first require you to pass the national certification exam given by the American Board of Opticians. This exam can be useful to take in non-licensing states, because it's a concrete credential employers can recognize.