[daniel_rh]

Optometrists and Ophthalmologists both have training to check for disease in the eyes. In fact a dilated eye exam is a non-invasive way to get an actual look into your circulatory system to check for things like diabetes. So even people without glasses should be getting regular checkups.

Ophthalmologists also have specialized training for cutting the eye that they learn in medical school (eg: lasik), but for eye exams, an optometrist has the skill-set necessary to perform these kinds of screenings.

A lot of people just get auto-refracted or a checkup by an optician and assume that's enough to get new glasses, but those people can be among the tens of millions of Americans who don't realize they have pre-diabetes.