Patent ID: 11903819
Assignee: ALCON INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A

Claim 5:
6. The ophthalmic lens of claim 2, wherein Zzone1 corresponds to the inner power zone and is described by the following equation:, Z
   
    zone
    ⁢
    1
   
  
  =
  
   
    
     
      c
      1
     
     ⁢
     
      r
      2
     
    
    
     1
     +
     
      
       1
       -
       
        
         (
         
          1
          +
          
           k
           1
          
         
         )
        
        ⁢
        
         c
         1
         2
        
        ⁢
        
         r
         2
        
       
      
     
    
   
   +
   
    
     A
     4
     ′
    
    ⁢
    
     r
     4
    
   
   +
   
    
     A
     6
     ′
    
    ⁢
    
     
      r
      6
     
     (
     
      0
      ≤
      r
      <
      
       r
       2
      
     
     )
    
   
  
 

wherein,
r denotes a radial distance from the optical axis of the optic,
c1 denotes the first curvature of the inner power zone,
k1 denotes a conic constant,
r2 denotes a radial distance from the optical axis to the second boundary,
A4′ is a fourth order aspheric coefficient, and
A6′ is a sixth order aspheric coefficient.