Astigmatism

We don't really see objects; rather, we see light reflected by them or generated by them. The light is collected by our eyes and focused on the retina, where it is converted into nerve impulses and sent to the brain, where it is formed into images.

Modern contact lenses first appeared in the 1940's. The average person has approximately 100-150 eyelashes on the upper eyelid. Each eyelash has a "life span" of approximately 5 months.