Surgeon recommends firms manufacture IOLs in 0.25 D steps

It would be helpful if IOL manufacturers made lenses available in 0.25 D steps and provided more detailed information regarding the optical design since refractive outcomes can now be predicted more accurately, according to Thomas Olsen from the University Eye Clinic, Aarhus Hospital, Denmark.

Dr Olsen obtained the refractive results from several thousand IOL implantations using optical biometry and compared them with the predictions made using regression methods, thick lens vergence methods and exact ray tracing methods. In each case the predictions were based on previously described true ACD-prediction algorithms.

It was discovered that thick lens vergence and exact ray tracing methods are more effective than regression methods and that refractive outcomes can be predicted accurately well below 0.5 D, which is the current power availability step.

The results indicate that it would be useful if IOLs were available in 0.25 D steps.