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

Claim 25:
26. The ophthalmic lens of claim 17, wherein Zbase corresponds to the base curvature and is described by the following equation:, Z
   base
  
  =
  
   
    
     
      c
      ⁢
      
       r
       2
      
     
     
      1
      +
      
       
        1
        -
        
         
          (
          
           1
           +
           k
          
          )
         
         ⁢
         
          c
          2
         
         ⁢
         
          r
          2
         
        
       
      
     
    
    +
    
     
      A
      4
     
     ⁢
     
      r
      4
     
    
    +
    
     
      A
      6
     
     ⁢
     
      r
      6
     
     ⁢
        
     where
     ⁢
        
     r
    
   
   ≥
   
    r
    3
   
  
 

wherein,
r denotes a radial distance from the optical axis of the optic,
c denotes a value of the base curvature,
k denotes a conic constant,
r3 denotes a radial distance from the optical axis to the third boundary,

A4 is a fourth order aspheric coefficient, and
A6 is a sixth order aspheric coefficient.