## Astigmatism surgery success

The last update for RSG is online. In the *Standard graphs -> Astigmatism* tab, you can now get the mean correction index, and the mean index of success for the astigmatism corrections. The correction index indicates if we over or undercorrect in magnitude but doesn't tell if we are treating the right direction, the angle of error indicates if we treat at the right direction, the index of success is a relative measure of success related to the amount of targeted astigmatism and ideally would be 0.

The success of the astigmatism surgery in percentage indicates how well we are doing taking into account the magnitude and the axis:

100% success will mean that all astigmatisms are on target in magnitude and axis, if we want no astigmatism postop then all the eyes will have no astigmatism post-op

0% success will mean, in the case we want no astigmatism postop, that the residual astigmatism is equal or larger in magnitude than the initial astigmatism.

To try the demo click here.

## Surgically induced astigmatism

There is a new update out for RSG.

In the astigmatism tab when you choose the preop cilinder range you can see how many eyes are shown. Also I added a new widget that tells you the mean surgical induced astigmatism for all the eyes (not just the selected).

Now, if in the excel you upload, you put as cilinder and axis preop and postop the K difference with the axis of the flattest meridian (the corneal astigmatism with negative cilinder) instead of the refractive, you can see the corneal astigmatism you are inducing.

I want to thank Cesar Albarran for verifying this with me.

Also a minor bug that made some graphics not to be shown when in the excel all the cilinder preop values where the same has been solved.

You can test it in the demo website here. If you want to upload an excel with up to 100.000 eyes you can get an account for RSGpro here.

## The European registry of quality outcomes for cataract and refractive surgery (EUREQUO)

The EUREQUO database (I quote from their website) *provides a means to audit surgical results and encourages surgeons to make adjustments to their techniques and improve their outcomes. One important use of the database is benchmarking. EUREQUO is funded by ESCRS*. The study *The European registry of quality outcomes for cataract and refractive surgery (EUREQUO): a database study of trends in volumes, surgical techniques and outcomes of refractive surgery* is based on it and there are several tables. I will make two graphics from the first two tables.

The first one is Number of refractive procedures (eyes), reported into the database, between February 4th 2004 and June 30th 2014umber of refractive procedures (eyes), reported into the database, between February 4th 2004 and June 30th 2014. Well to put the percentages by procedure in a graphic is really straight forward:

The number of eyes is different from the one reported in the study of 27339 but 26598 is the number of procedures I get by adding all the number of procedures from the table.

The second table is Type of (primary) procedure, indication, mean age and range of preoperative refraction. This one is more interesting since it gives procedure, indication, mean age at surgery, maximum and mean refraction preop by indication and number of eyes. Now, leaving aside mean age at surgery I will show you all the other data in a single graphic:

Each bar shows the range, the bar width is proportional to the number of eyes, and the vertical lines are the mean refraction for that bar, that means that for PRK for myopes the mean is -3.2 D and for the hyperopes +1.5 and you can see very easy that there are many more myopes than hyperopes for PRK (3693 myopes and 308 hyperopes from the table). We can also see that although for lasik and hyperopes the range is larger than for RLE, the mean is smaller.

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