Sharpness of objects at 20 ft
Vison Tests
An eye chart 
Correction Options
Eyeglasses
What it is
Oldest form of vision correction
Practical and afordable
How it works
Bends the light coming into the eye
Uses concave and convex lenses
Concave for nearsightedness
Convex for farsightedness
Contact Lenses
What is it
Better for active people
Sit on your eye
Can wear sunglasses with them
Different brands, colors, and materials
How it works
They are directly on your eye so they can be thinner
Corrective surgery
What is it
Changes refractive (light bending) properties of the eyes
The surgery is not cosmetic it is functional
No dependence on glasses or contacts
How it works
Surgeon cuts a flap in the cornea
Opens up the flap
Uses a laser to put in a unique corrective pattern
Citation:
Kozarsky, A (2014) Eye Health and Vision Basics [web] retrieved from; http://www.webmd.com/eye-health/vision-basics Date accessed: January 6, 2015
Thanks for the post Lauren! Did you know there's actually an app called Eye Surgery that lets you carry out an eye surgery? I think it's free, but I checked it out when I taught you guys about lenses. Pretty cool process. They make it seems so simple.
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