1. Invention of “Glasses/lenses”
Ngawang Tsering

2. Reason “why?” No visual instrument, ancient Egyptians, Greeks, Romans
Prominent roman stressed resignation in old age
Can’t read for himself
Can’t do his daily work
Turning blind slowly

3. Beginning “how?” 4 B.C, Roman tragedian Seneca
He read books through water glass globe
He got the magnification of the letter
Reading stone

4. creation Developed glass globe into lens
1284 in Italy, Salvino D'Armate
No more placing on reading material
Easy to read

5. Importance Chinese developed it 2000 year ago
Purpose, to protect eye from evil force
Around the world glasses are fashion
Prescribed for eyes
Protective glasses at work, labs,
ski, swimming, dive

6. Effects Invention of glasses/lenses led to many technology
 1752, James Ayscough introduced his spectacles with double-hinged side pieces
1929, Sam Foster sold the first pair of Foster Grants sunglasses 
1929 edwin land: polaroid sunglasses, glare-free automobile headlights and stereoscopic (3-D) photography

7. New development 1988, Adolph Fick thought contact lens
1948, Kevin Tuohy invented soft plastic contacts
Now, lasik vision with synthetic lens

8. Future Might be more clear than ever
More beneficial and more convenient
Let’s see if it can be possible