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Title	A new method for measuring rotational stability of toric intraocular lenses
Abstract Nr.	1071

Purpose	To improve the evaluation of rotational stability of toric intraocular lenses (IOL) by using opposite landmarks created on the anterior capsulorhexis' edge and to assess the rotational stability of the AT TORBI 709M ( Carl Zeiss Meditec) IOL using this new method.
Methods	23 eyes of 16 consecutive patients with senile cataract and greater than 1.75 diopter of preoperative regular corneal astigmatism were included prospectively. An anterior capsulorhexis was fashioned in order to get two sharped landmarks in opposite sites of the capsulorhexis' edge. A toric IOL (AT TORBI 709 M) implantation was performed after phacoemulsification. Retroillumination photographs to identify IOL axis and anterior capsular landmarks were obtained at the end of the surgery (supine position), 1 day, 1 week, 1 month and 6 months after surgery. The relative position of the IOL to the anterior capsule was determined by calculating the angle alpha between the IOL orientation marks and a line passing through the two anterior capsulorhexis’ edge landmarks. To determine IOL rotation, we compared immediate post-operative angle alpha with angle alpha at 1day, 1 week, 1month and 6 months.
Results	The average IOL rotation was 2.08±1.25 degrees at 1 day, 1.75±1.26 degrees at 1 week, 2.60±1.39 degrees at 1 month and 2.52±1.61 at 6 months.
Conclusion	This new method for measuring postoperative toric IOL axis rotation is probably the most straightforward. The anterior capsulorhexis’ edge landmarks are in the same plane of the IOL orientation marks. The procedure is independent of head tilt or eye rotation. The AT TORBI 709M IOL shows an excellent post-operative rotational stability.

Authors 1

Last name	HUA
Initials	MT
Department	UZ Leuven
City	Leuven

Authors 2

Last name	Gillard
Initials	P
Department	CHR Citadelle Liège
City	Liège