Polycarbonate Finished Progressive

Finished

Progressive Lenses have no visible lines and provide a smooth gradual
progression of power from distance vision on top through intermediate
vision to near vision on bottom.

Power Range

Minus power: -0.00 ~ -3.00 Plus Power: +0.25 ~ +3.00
ADD : 1.00D to 3.00D in 0.25D steps    

SPH

ADD (+)

1.00

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

+3.00

+2.75

+2.50

+2.25

65 mm

+2.00

+1.75

+1.50

+1.25

+1.00

+0.75

+0.50

+0.25

-0.00

-0.25

-0.50

-0.75

-1.00

-1.25

70 mm

-1.50

-1.75

-2.00

-2.25

-2.50

-2.75

-3.00

Semi-Finished

SPH

ADD (+)

1.00

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

2.75D

75mm

4.75D

6.75D

Diameter
mm

Base Curve

Depth
@50mm

Depth
@40mm

Center Thickness

Edge Thickness

RX True Curve@1.530(D)

Back Curve

ADD

Design and Suggested RX Range

75mm

2.75 D

1.73±0.02

1.12±0.02

10.6±0.3

12.5±0.3

2.90±0.05

4.25

+1.00 to +3.00

-2.25
  to
-7.00

4.75 D

2.85±0.02

1.84±0.02

12.5±0.3

10.5±0.3

4.81 ±0.05

4.25

+1.00 to +3.00

+175
  to
-2.00

6.75 D

3.98±0.02

2.55±0.02

9.5±0.3

8.1±0.3

7.0±0.05

6.25

+1.00 to +3.00

+5.00
  to
+2.00

Please avoid storing lenses above room temperature：
Storing lenses under high temperature will reduce shelf-life, and greatly deteriorate photochromic lenses, lenses could suffer from poor performance and aging. Lenses will peel  in the worst scenario. 
Recommended: Storing lenses in a constant  temperature of 20 - 20 ℃ and avoid UV light (artificial or sunlight) to extend shelf-life.
Example: In car and shelf exposed to direct sunlight (UV exposure)

Please avoid storing lenses under high humidity：
For normal anti-fog lenses: Storing these lenses under high humidity environemnt will deplete anti-fog coating's performance. Rinse and cleaning with water or any kind of chemical solution should also be avoided.
Storing under 55% humidty level and cleaning with dry cloth can help to increase shelf-life.

Pleae avoid strong chemical solution：
Ophthalmic lenses are delicate, any kind corrosive chemical solution may cause permanet damage.
Alcohol pr mild cleaning agent is recommended. Room / solution temperature should be kept below 40℃, or the lens could be damaged.
The above does not apply to photochromic and anti-fog lens.
** photochromic and anti-fog lens should be cleaned using dry cloth only**

Becareful during fitting and grinding：
Photochromic lenses are softer than normal lenses, too much clampping pressure during fitting or grinding could result in dent or depressed surface. 
Soft padding is recommended to reduce clampping pressure.