IOL Calculation Web Links

http://iol.ascrs.org - helpful links for post refractive surgery lens implant calculations
http://www.lricalculator.com - helpful LRI calculator online
http://www.acrysoftoriccalculator.com/ - toric IOL T3,T4,T5 calculator for sn60wf IOL
http://doctor-hill.com/physicians/physician_main.htm Dr. Hills collection of formulas
http://www.ocularmd.com includes 10 IOL formulas and contributions to database an option

societies
http://www.ascrs.com/
http://one.aao.org/CE/MOC/MOCStudyResourcesDetail.aspx?Topic=1 MOC Exam Study
http://www.aao.org/isrs/ AAO refractive society
http://www.ophthalmologytimes.com/
http://www.eyecounselor.com

---

Helping your favorite cause is as easy as instant messaging. You IM, we give. Learn more.

IOL lens Calculation after LASIK/refractive surgery

Post-LASIK IOL calculation Formulas

  

Rough Rule:  add 1 D of IOL power for every 3 to 4 D of LASIK Treatment

 

Masket Regression Formula:

--Adjustment to IOL Master determined power by

=  (Diopters of LASIK Tx) *(0.326)+0.101

 

Latkeny Regression Formula

--use flattest K found now for IOL Master

--target emmetropia or Rx chosen

--adjust by Latkany formula:  -(0.47x+0.85)    where  x = preLASIK spherical equivalent

--example:  for -6 myope post tx =  -(-3+0.85) = +1.97,  or add 2D to IOL power for plano based on flattest K now with IOL Master

 

Corneal Bypass Method  (Keith Walter, JCRS Mar 2006)

--IOL Master with original K values, current axial length

--set target on IOL Master to preLASIK RX to obtain Plano post CEIOL today

 

Topographic Central Corneal Power Adjustment (Koch & Wang)

--Take central power of apical point on Atlas Topographer

--adjust this K power by (0.19)*(Diopters of LASIK treatment)

--use this adjusted K to in Holladay II formula to target IOL power today

 

Feiz Mannis Nomogram  (Ophthalmology vol. 112, N.8, Aug 2005)

--Post Myopic LASIK IOL Power adjustment

-- probably least likely for hyperopic surprise, may overcorrect

D Tx:    Increase IOL Power by

1           0.36

1.5        0.66

2           0.96

2.5        1.25

3           1.55

3.5        1.85

4           2.15

4.5        2.45

5           2.74

5.5        3.03

6           3.34

6.5        3.64

7           3.93

7.5        4.23

8           4.53

8.5        4.83

9           5.12

9.5        5.42

10         5.72

10.5      6.02

11         6.31

11.5      6.61     

12         6.91

 

---

Helping your favorite cause is as easy as instant messaging. You IM, we give. Learn more.