US Navy 070808-N-6278K-249 Hospital Corpsman 2nd Class Mark Andrews, an optician attached to the Military Sealift Command (MSC) hospital ship USNS Comfort (T-AH 20), instructs a patient how to read an eye test chart
Autor: U.S. Navy photo by Mass Communication Specialist 2nd Class Joan E. KretschmerQuelle: commons.wikimedia.org