Mydriasis (/máµ»ËdraÉª.ÉsÉªs/) is the dilation of the pupil, usually defined as when having a non-physiological cause, but sometimes defined as potentially being a physiological pupillary response. Non-physiological causes of mydriasis include disease, trauma, or the use of drugs. Normally, as part of the pupillary light reflex, the pupil dilates in the dark and constricts in the light to respectively improve vividity at night and to protect the retina from sunlight damage during the day.
The Cold War Museum. The Strategic Defense Initiative (SDI): Star Wars. The Strategic Defense Initiative (SDI), also known as Star Wars, was a program first initiated on March 23, 1983 under President Ronald Reagan. The intent of this program was to develop a sophisticated anti-ballistic missile system in order to prevent missile attacks from other countries, specifically the Soviet Union.
The Cold War (1948 - 1990) was the tense relationship between the United States (and its allies), and the Soviet Union (the USSR and its allies) between the end of World War II and the demise of the Soviet Union.n the Soviet war in Afghanistan starting in 1979, the Soviet Union had a difficult time fighting resistance groups, some of them armed and trained by the United States. The Soviet Union's failed invasion of Afghanistan is often compared to the United States' failure during the Vietnam War.