Post-surgical rotation of Hoya’s Vivinex intraocular lens (IOL) was recently assessed by Professor Rupert Menapace, University of Vienna, Austria, and published in the British Journal of Ophthalmology.1
The study reported as follows:
“The study methodology was fine tuned to minimise secondary rotation and it is standardised to ensure consistency between procedures:
- Evaluation was made using the monofocal IOL base platform. This has two benefits, firstly recruitment is not limited to patients with astigmatism, and secondly any rotation does not impair vision and result in patients leaving the study for corrective surgery.
- Cohesive OVD (ophthalmic viscosurgical device) was used to anchor the lens during surgery, and three minutes between surgery completion, and meridional measurement was given to ensure the haptics fully unfolded.
- Close attention was given to ensuring that all eyes are normotonic at the end of surgery.
- Haptic junctions and scleral landmarks such as emissaria were used as reference points. The meridional position was then measured at: end of surgery (patient supine on operating table); one hour; one day; one week; and at four to six months. ”The results (n= 103 eyes):
- No rotations exceeded five degrees at any individual time point including at final follow up, and
- Median and mean rotations were very low, as was the standard deviation. ”Unlike other popular IOL platforms tested with the same methodology (data yet to be published) only Hoya Vivinex:
- Showed no correlation between rotation and either white-to-white distance or axial length, and
- Was free of any rotations significant enough to require surgical intervention.
“Finally, we concluded that the key period for rotational stability is the hour immediately after surgery. If first measurements were taken later than hour one, an IOL platform will appear more stable than it actually is.”
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- Schartmüller D, Schriefl S, Schwarzenbacher L, Leydolt C, Menapace R. True rotational stability of a single-piece hydrophobic intraocular lens. British Journal of Ophthalmology. 22 Jan 2019. doi: 10.1136/bjophthalmol-2019-313834