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Need help to understand (prism problem)

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    Need help to understand (prism problem)

    Dear sir(s),I have some problem to understand the below prescription:
    Re- +4.5/-2.5*155 & dcntr -2.90 in//4.90 up
    Le-+4.75/-3.25*20 & dcntr-3.40 in//4.90 up
    BE ADD-2.00
    BE 2.37 ∆ @270
    It's a ff progressive lens
    I,m not able to understand how 2.37 ∆ prism comes.

    #2
    I'm thinking it's 2.37 prism diopters base down, both eyes, for prism thinning.

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      #3
      Drk sir,yes u r right,but how it's come 2.37 base down?I just want to know the calculation which conclude this prism value.
      Thanks in advance for ur help.

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        #4

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