Something that causes a response in a body part or organism. A stimulus may be internal or external. Sense organs, such as the ear, and sensory receptors, such as those in the skin, are sensitive to external stimuli such as sound and touch.
Just curious...given my insurance plan I can get a new pair of frames and lenses once every 2 years, but I realllly love glasses so I tend to purchase about 2 pair per year...Gotta have my style...oh and of course the added benefit of sight is a nice plus:)
Here's how to keep your vision â and your budget â in focus. by Sid Kirchheimer, November 19, 2013 | Comments: 0. Understand your options (and the costs) before buying your next pair of eyeglasses. â Getty Images. Nearly 8 in 10 Americans over age 55 require prescription lenses. And they're paying a pretty penny for that need. The cost of prescription glasses averages more than $200 out of pocket, and the price can easily double if you opt for a quality pair of no-line progressives, favored by the majority of older consumers.