Barrett, Olsen, RBF, multi
We would like to know how to go about adding Barrett and Hill RBF formulas to hicsoap?
The Holladay 2 Formula with the Non Linear Regression that is now available in the Software is equal to or better than the Barrett or RBF Formulas. This was determined in the article by Melles and Holladay in Ophthalmology in the December electronic version. The Barrett and RBF are both proprietary, like the Holladay 2 and are unavailable.
Does the software have Barrett or RBF calculation formulas?
No ... it has the Holladay 2 and 1 which have been shown to be as good as the BARRETT 2 and OLSEN2. The RBF is a distant third.
My physician would like to know if our Lenstar software has the latest software for the Barrett, Olsen and RBF formulae?
The Olsen 2, Barrett and RBF Formulas have finally caught up with the Holladay 2 and the first two use all seven variables (AL, K, ACD, LT, WTW, Age and Ref) to achieve greater than 90% within 0.50 D when the Lens Constant is Personalized by entering post op data. If you are entering you post op data into the Program, nothing else will give you better results.
Is there an option to do a multi formula IOL calculation? I often know the lens that I want to use. The multi-formula approach allows me to utilize all the formulas to fine tune my lens selection.
No … the other formulas are there so you can see the superiority of the Holladay 2 on the Formula and Lens Constant Analysis Screen. Using the other formulas for a Patient reduces the accuracy of the calculation and quality of outcomes.
My boss has asked me to perform 2 updates, the Barrett 2 formula & the Warren Hill RPM and I would like to request help with completing this task.
The Holladay IOL Consultant has the Holladay 2 Formula using the Wang/Koch Axial Length adjustment. When you enter postoperative refractions into the Software a Personalized Lens Constant (PLC) is determined from the data. The Barrett 2, Olsen 2 and RPM have finally caught up with the Holladay 2 and use 7 variables to predict the Effective Lens Position (ELP). With the Holladay 2 and personalization you should expect over 90% of your cases to be within 0.50 D. No other formula has shown this accuracy in an independent study with a large number of cases (>500).
There is no need to add these formulas to our software.
We are noticing a large shift in the formulas our physicians are requesting. The most significant change being more requests for Barrett and Olson formulas, and less trust in Holladay 2. Can you tell me if there are any plans to include these in Hicsoap? Otherwise, hicsoap wouldn’t continue to be as useful for us.
For the spheroequivalent calculation, the Holladay 2 continues to provide the best results. Two recent articles by Abulafia for Toric IOL Calculations used ZERO for the SIA for the Holladay Toric Calculation and Barrett has a BUILT IN SIA of 0.50 D @ 180 (against the rule). In the Holladay Toric Calculator there is a CHECK BOX (shown below) that when checked determines the OPTIMAL SIA for a small temporal incision. It was determined from over 500 cases from 20 surgeons in a controlled FDA trial and will be the basis for the approval of the T2 (1.00 D of toricity) IOL. No other calculation was able to achieve these results.
Attached is the Letter to the Editor the will be appearing shortly in JCRS explaining above.
In short, the Holladay IOL Consultant with the Holladay 2 and the EXACT TORIC CALCULATOR will give better results than anything else.