He may use an odd looking helmet called an "indirect ophthalmoscope ... making a yearly dialated eye exam well worth the time.

Fundic exam. The posterior portion of the ... use indirect ophthalmoscopy to examine the back of the eye (Fig. 3). A direct ophthalmoscope or panophthalmoscope may also be used to visualize ...

says that an eye exam can reveal health ailments such as diabetes and high blood pressure that are affecting a person's entire body. "Your eyes are like a window into your overall systemic health ...