Study finds, Rotational Stability of Intraocular Lenses as a
A Study was conducted to assess the reliability and reproducibility of a new semi automated evaluation method Rotix for intraocular lens rotation (IOL) and to define a standardized evaluation method for future toric IOL studies.

A dataset of 25 patients with 2 consecutive follow-up visits was created to test the intra- and inter-rater reliability. A datatest set of 10 patients including 30 pictures taken 5 minutes apart was created to test the short-term reproducibility.

Evaluation of IOLs with rotational stability using non-toric implants in 25?×?2 consecutive follow-up visits was done. Two experienced graders performed axis evaluation 3 times in a randomized order. One experienced grader performed axis evaluation for the short-term reproducibility study. Reference landmarks at the end of operation were used to assess the IOL axis.

--Mean standard deviation for intra-rater reliability was 0.16 degrees.

--The intra-class correlation coefficients (ICC) were 0.97 for grader 1 and 0.96 for grader 2, respectively.

--A very high inter-rater correlation of 0.95 was found. The mean individual difference between grader 1 and grader 2 was 0.061± 0.28 degrees.

--Short-term reproducibility showed a mean standard deviation of 0.22±0.14 degrees.

In conclusion, the new semi-automatic evaluation method demonstrated precise reliability between and within the rater. The repeatability of short durations was lower than 0.25°C. In future IOL experiments, the method of employing non-movable reference markers provided reliable findings and should be a standard.