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Focusing or dispersing light emitted from an object can change how we see it in many different ways.

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Contact Lenses

How do contact lenses work?

Credit: Bpw
Source: http://commons.wikimedia.org/wiki/File:Contact_lens.JPG
License: CC BY-NC 3.0


A lens is an object that is transparent and refracts or bends light to form an image. One common type of lens is a contact lens, which is designed to improve vision without wearing glasses. Contact lenses are mainly made out of plastic and worn for various amounts of time. 

Nearly 36 million Americans wear contact lenses for corrective purposes, cosmetic purposes, or simply to add to a fun Halloween costume. Because contact lenses are closer to natural sight than eyeglasses, they don't get in the way of your line of sight. They can be worn all day, or even for weeks, so people don't worry about putting them in and taking them out. They stay in place by sticking to the layer of tear fluid that floats on the surface of the eye, and from eyelid pressure. 

Creative Applications

  1. Are contact lenses concave or convex? 
  2. How do they stay comfortable in your eyes? 
  3. What exactly does the contact lens do? 
  4. Can a contact lens ever obstruct your vision? 



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  1. [1]^ Credit: Bpw; Source: http://commons.wikimedia.org/wiki/File:Contact_lens.JPG; License: CC BY-NC 3.0

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