The COA will give you basic knowledge to help you become a more competent tech. You will find that as you study you will learn things that you never heard of before. I learned why a rose bengal drop was used and the differences between soft and hard contact lenses. You will learn something new and you will become more competent because of it.
The COA will give future employers more confidence in hiring you The general trend in jobs for ophthalmic assistants is going up.