LV MT2 Eq

  1. Ratio of comparisons
    chart?chf=bg,s,00000000&cht=tx&chl=%5Cfrac%7BcurrentVA%7D%7BgoalVA%7D%5Ctimes%7Binverse%20of%20WD%7D%3DFeq&chs=512x76
  2. Kestenbaums method
    Inverse of BCVA
  3. Conventional mag
    Mag = D/4 + 1
  4. Effective mag
    Mag = D/4
  5. Convergence demand
    • Convergence = MA x PD (in cm)
    • MA = 100/WD
  6. Prism for half eyes
    Plus power + 2 for each eye
  7. Equivalent power
    Fe = F1 + F2 - d(F1)(F2)
  8. HHM FoV
    • W = d x (f/h)
    • W = linear width of field
    • d = diameter of lens
    • f = focal length of mag
    • h = distance of lens from eye
  9. Equivalent power for electronic devices
    Fe = Mag x F2
  10. Mag of telescopes
    Ma = -Foc/Fob
  11. Tube length
    chart?chf=bg,s,00000000&cht=tx&chl=t%20%3D%20f_%7Bobj%7D%20%2B%20f_%7Boc%7D&chs=194x42
  12. Exit pupil of telescope/mag check
    Mag = (entrance pupil diameter)/(exit pupil diameter)
  13. Telemicroscope exact formula for vergence
    • chart?chf=bg,s,00000000&cht=tx&chl=L'_%7Boc%7D%20%3D%20%5Cfrac%7BM_a%5E2L%7D%7B1-tM_aL%7D&chs=222x80¬†where
    • L'oc = vergence leaving telemicroscope
    • L = divergent light hitting objective lens
    • t = tube length (meters)
    • Ma = mag of TS
  14. Approximate formula for telemicroscope divargence
    chart?chf=bg,s,00000000&cht=tx&chl=L'_%7Boc%7D%20%3D%20%5Cfrac%7BM_a%5E2L%7D%7B1-tM_aL%7D&chs=222x80
  15. Approximate formula for telemicroscope divergence
    chart?chf=bg,s,00000000&cht=tx&chl=L'_%7Boc%7D%3DMa%5E2L&chs=194x42
  16. Stand mag equivalent power
    Feq = F2 x ER
  17. Lateral mag of a stand magnifier
    ER = (L'-F1)/L' = L/L'

    F1 = power of stand mag lens
  18. Working distance of stand mag
    f2 - l'
Author
mbills
ID
352528
Card Set
LV MT2 Eq
Description
equations
Updated