In the article Laser in-situ keratomileusis for refractive error following radial keratotomy,  table 1 is about the preoperative and postoperative (1 year) refractive status. I am going to make two plots with the data from that table.

The first one is the prelasik spherical equivalent (SE) with the one year postlasik SE, the colour of the points is related to the postop uncorrected visual acuity (UCVA), as you can see there are only 4 values for that visual acuity but the table has just 18 observations. Here is the result:



As expected the higher UCVA are close to the zero SE postop although in the point with -2 postop SE and UCVA of 0.66 the visual acuity might be an error or taken with a pinhole. In the second plot I will look at the cumulative percentage of observations when we lower the best corrected visual acuity (BCVA), preop and postop:



Here we can see that before lasik all patients had 0.5 or better BCVA and over 25% had 1 or better while after lasik all had 0.66 or better BCVA and around 60% had 1 or better. You can find the code to reproduce the graphics here.