Employment of clinical, counseling, and school psychologists is projected to grow 20 percent from 2014 to 2024, much faster than the average for all occupations. Greater demand for psychological services in schools, hospitals, mental health centers, and social services agencies should drive employment growth.
Computer glasses are for intermediate viewing distance (distance from your seated position at your desk to your computer (usually about 50cm to a meter) Driving lenses usually do not have any reading power and are referred to as single vision lenses.
From the center of the lens all the way to where it's object is and it's object is over here which is not 18. That's why it gave you this distance between lenses. The distance between lenses is 33 centimeters. So if the distance from this 1st lens is 18 well the difference has to be equal to this length.