Lens materials

Advantages:

1. Good Optical quality

2. More shatter resistant than glass lenses

3. Lightweight

4. Accept tints easily with uniform grade colours

Disadvantages:

1. Require a scratch-resistance

2. 20%-30% thicker than PC

3. Require a special coating for UV light

Advantages:

1. Excellent impact resistant (10 times than other lenses)

2. Thin, 20%-25% thinner than other

3. Lightweight, 20% lighter than plastic

4. Can blocks 100% UV without coating

Disadvantages:

1. More lens reflection

2. Requires scratching coating

3. Less clear in strong prescription power

Advantages:

1. Don’t need scratch coating

2. Excellent optical clarity

3. AR coating adheres to glass very well

Disadvantages:

1.At least twice of weight of other

2.Shatter than other lens easily

3.Require UV coating

4.Thicker than PC or high index plastic lenses

Advantages:

1. Thin

2. Lightweight

3. Much more impact-resistant than regular plastic

or glass lenses

4. Crisper optics than injection-molded

polycarbonate lenses

Disadvantages:

1. Thicker than polycarbonate

(Lower refractive index than polycarbonate)