Patent ID: 11892713
Assignee: ALCON INC.
Field: Optics (Instruments)
Classification: CPC G  A | IPC A  G

Claim 7:
8. The ophthalmic lens of claim 1, wherein:, Z
    base
   
   (
   r
   )
  
  =
  
   
    
     cr
     2
    
    
     1
     +
     
      
       1
       -
       
        
         (
         
          1
          +
          k
         
         )
        
        ⁢
        
         c
         2
        
        ⁢
        
         r
         2
        
       
      
     
    
   
   +
   
    
     a
     2
    
    ⁢
    
     r
     2
    
   
   +
   
    
     a
     4
    
    ⁢
    
     r
     4
    
   
   +
   
    
     a
     6
    
    ⁢
    
     r
     6
    
   
   +
   
    
     a
     8
    
    ⁢
    
     r
     8
    
   
   +
   
    
     a
     10
    
    ⁢
    
     r
     10
    
   
  
 

and:
r denotes a radial distance from the optical axis in units of (mm);
c denotes a base curvature of the surface;
k denotes a conic constant;
a2, a4, a6, a8, and a10 are, respectively, second, fourth, sixth, eighth, and tenth order coefficients.