My friend was diagnosed with keratoconus.

My mother is going to the ophthalmologist because of keratitis.

This is a model of a mutetrahedron.

This is a model of a muoctahedron.

He was diagnosed with prostate cancer.

He was tried for the crime of desertion in the face of the enemy.

Let's participate in the election by using early voting.

It's difficult to understand the context of this sentence.

The lens of this camera is easy to attach and remove.

He is an expert in physical anthropology, conducting research on human evolution.