This article is from the Vision and Eye Care FAQ, by grants@research.canon.com.au (Grant Sayer) with numerous contributions by others.
Benefits
- no need to wear glasses
- no spectacle scotoma - ie "blind-spot" due to frame edge
- overcome problems of spectacle magnification, especially when large
difference in spectacle prescription between the two eyes.
Risks
- corneal odema
- corneal ulcers
- contact lens induced conjunctivitis
 
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