1. Prepared By

2.  Spectacles are the most widely used visual instrument in
the world
 Spectacles, also known as Glasses, are frame
bearing lenses worn in front of the eyes.
 They are normally used for vision correction or eye
protection.

3.  Approximately 207 million people wear
glasses.
 About 64% adults wear eyeglasses.
 Nearly 3 million children under 4 years wear
spectacles.

4.  Chinese used special type of spectacles to protect their
eyes in hazardous situation.
 Egiptians first invented the method of magnification of a
particle eith the help of polished rock crystal.
 Eyeglasses first appeared in Pisa, Italy, around the year
1286.
 The first known artistic representation of eyeglasses was
designed about 50 years latter.

5. Types of Spectacles
Some other types of Spectacles:
Photochromic Lenses Trifocals
Bifocals Varifocal

6. Spectacle frame consist of:
Metal Frame
 Pure Titanium frame
 Non-Allergenic Nickel coated frame
 Stainless steal frame
 Titanium alloy Frame
Plastics Frame

7. Lens Materials:
Glass Lenses
Plastic Lenses (CR39)
Hi-Index Lenses
Polycarbonate Lenses
Aspheric Lenses

8. Keeping glasses in a hard case
Cleaning with warm soapy water
Taking off before sleeping
Keeping the Screws of the spectacles Tight
To avoid touching the lens while removing from
eyes

9. Light Weight
Least Thickness
Comfortable Frame
Photochromic Eyeglasses
Anti-Reflective Coating
Anti Scratch Coating