Patent ID: 11885706
Assignee: TRANSITIONS OPTICAL, LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. The method according to claim 1, wherein the contact lens is positioned covering the ocular surface before measuring the first and second intensities, wherein the measurements of the first intensity and the second intensity are taken from a same image, wherein the first intensity is measured from a portion of the ocular surface that is not covered by the contact lens, wherein the second intensity is measured from a portion of the ocular surface (100) that is covered by the contact lens, and the method further comprises:
converting the measurement of the first intensity to CIE XYZ values;
converting the measurement of the second intensity to CIE XYZ values; and
determining the transmittance according to the following equation:, T
    Y
  
  =
  
    
      log
      
        1
        ⁢
        0
      
    
    ⁡
    
      (
      
        
          Y
          uncovered
        
        
          Y
          
            covere
            ⁢
            d
          
        
      
      )
    
  

where:
TY is the transmittance of the contact lens determined according to CIE Y values;
Yuncovered is a Y value of the portion of the image of the ocular surface, wherein the ocular surface is not covered by the contact lens; and
Ycovered is a Y value of the portion of the image of the ocular surface, wherein the ocular surface is covered by the contact lens.