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:)
Typically, if you are planning to buy a pair of prescription glasses from a store, first up, you gotta take a professional eye test with the clerk or eye doctor. Then, you will be told to wait some time, usually 40 minutes to 1 hour. Afterwards, you might come back and get your glasses. It is not too lenthy.