Most people think of eye exams as something done to detect a need for eye glasses, prescription sun glasses or contact lenses. That is one of the results of an eye exam, but that isn't what they are "for." The reason for eye exams is to check the total health of the eye. Sometimes, problems with seeing things clearly might be from eye diseases or other health issues that affect vision. Optometrists are trained at looking for health problems and will be able to detect a variety of diseases from the instruments used during an eye exam.
Here are the most common diseases caught by optometrists who practice full scope primary eye care:
High Blood Pressure
When the doctors do a full examination, they'll be able to use all the tools available to them to make determinations if there are any underlying issues with reported vision problems. Sometimes, there won't be any reported vision problems and the diseases will be caught in an early stage that makes managing them much easier. So don't think that the only thing eye exams detect is a need for corrective lenses, they do so much more than that.