1, report within the specified time in the morning. For beginners, wearing contact lenses is a very troublesome thing, and the more urgent it is, the harder it is to wear it.

2. Contact lenses need some time to adapt at first, which is not good for military training.

3, military training sweats a lot, it will be very uncomfortable to flow into the eyes, and the eyes will have a tingling feeling. You can't just wipe your sweat.

4, military training is outdoors, dust easily enters the eyes, causing eye discomfort.

Frame glasses can be fixed with ropes.