Plus lenses increase in effective power as the vertex distance is increased.

You are concerned about the effects of texting on driving performance, and want to design a study to test the response time of drivers while texting and while driving only.   Your plan is to record the number seconds it take for a driver to respond when a leading car hits the brakes. Your research partner wants to divide participants randomly into two groups: one to drive without distraction and one to text and drive simultaneously.  Is this a good idea? Why or why not?

In Emphysema, the alveoli:

What is the prescription of the optical cross: Power at 090 = -3.75 Power at 180 = -1.00

A person who has had a brain attack (stroke) may:

Identify the term for the following definition: A state of confusion that seems to worsen as evening wearing on and the sun goes down

Which blood vessel carries oxygenated blood away from the heart?

Identify the term for the following definition: nil per os-nothing by mouth

Identify the term for the following definition: Having to do with thinking, remembering and reasoning

On a certain baseball team, the average age is [avg] years old, with a standard deviation of [sd] years. Find the age that is [x] standard deviation(s) above the mean.   Give exact answer.  Do not round.