Patent ID: 11953759
Assignee: RODENSTOCK GMBH
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. A lens having two permanent markings, a first reference point, and a near reference point, wherein:
an astigmatism at a second reference point deviates by at least 0.5 dpt from a value predetermined by a prescription for an astigmatism at the near reference point, or by at least 0.5 dpt from an astigmatism at the first reference point; and
a difference of a vertical prismatic effect at the first reference point and a vertical prismatic effect at the near reference point deviates by at least 0.5 cm/m from a value ΔPr90, or
a difference of a horizontal prismatic effect at the first reference point and a horizontal prismatic effect at the near reference point deviates by at least 0.5 cm/m from a value ΔPr0, wherein:

ΔPr90=0.2+0.7008SF+0.8992SN−0.008SN2 

and, Δ
   ⁢
   P
   ⁢
   
    r
    0
   
  
  =
  
   
    
     -
     
      s
      
       F
       ⁢
       0
      
     
    
    +
    
     s
     
      N
      ⁢
      0
     
    
   
   8
  
 

and wherein:
SF90 refers to the refractive power in the vertical direction at the first reference point;
SN90 refers to the refractive power in the vertical direction at the near reference point;
SF0 refers to the refractive power in the horizontal direction at the first reference point; and
SN0 refers to the refractive power in the horizontal direction at the near reference point; and
the first reference point is situated centrally on the straight line connecting the markings, and the near reference point is offset downward by 16 mm and nasally by 2.5 mm relative to the first reference point.