Progressive Concord Blank Data

 Hard Resin Index 1.498 Diameter 75/80 **

Nominal Base	Actual Front Curve *	Front Curve (1.498)	Radius in mm	50mm Sag	Rear Radius	Rear Curve *	Add Power	Edge Thick	Center Thick
2.00	2.06	1.94	257.28	1.22	118.5	4.47	0.75-3.50	14.0	10.6
4.00	4.06	3.81	130.54	2.42	118.5	4.47	0.75-3.50	12.0	13.4
5.50	5.55	5.21	95.50	3.33	81.79	6.48	0.75-3.50	8.0	6.5
7.50	7.33	6.89	72.31	4.46	81.79	6.48	0.75-3.50	8.0	9.4

 N157 Medium Index 1.566 Diameter 75/80 **

Nominal Base	Actual Front Curve *	Front Curve (1.498)	Radius in mm	50mm Sag	Rear Radius	Rear Curve *	Add Power	Edge Thick	Center Thick
1.50	1.60	1.50	331.45	0.94	70.67	7.50	0.75-3.50	14.0	6.4
3.00	3.21	3.02	164.95	1.91	70.67	7.50	0.75-3.50	14.0	8.4
5.25	5.31	4.99	99.87	3.18	81.79	6.48	0.75-3.50	8.0	6.2
7.00	6.86	6.45	77.25	4.16	81.79	6.48	0.75-3.50	8.0	8.6

 Photo Chromatic Grey and Brown Medium Index 1.556 Diameter 75/80 **

Nominal Base	Actual Front Curve *	Front Curve (1.498)	Radius in mm	50mm Sag	Rear Radius	Rear Curve *	Add Power	Edge Thick	Center Thick
1.50	1.60	1.50	331.45	0.94	81.79	6.48	0.75-3.50	14.0	7.9
3.00	3.21	3.02	164.95	1.91	81.79	6.48	0.75-3.50	12.0	8.2
5.25	5.31	4.99	99.87	3.18	81.79	6.48	0.75-3.50	8.0	6.2
7.00	6.86	6.45	77.25	4.16	81.79	6.48	0.75-3.50	8.0	8.9

 * Actual Front Curve and Rear Curve in Reference to Index 1.53
 ** 2.5 mm decentration allows for bigger frames