Purpose:
To compare stability into capsular bag of two different IOLs.
Methods:
70 eyes of 68 patients (mean age 75±10years), were enrolled. A first group (37 eyes) having received implant with hydrophilic aspheric Akreos Adapt Advanced Optics (four haptics) was compared to a second group (31 eyes) having received hydrophobic, spherical AcrySof Natural SN60AT IOL (two haptics). The authors developed an automatic image processing technique of evaluation of two parameters: decentration and rotation of the IOL with respect to the corneal limbus (Figure1). A first reference picture of anterior segment of the eye under midriasis was taken for all eyes at 2nd postoperative day after cataract surgery. At 30th and 100th day of follow up, decentration and rotation of IOL were digitally measured by the software. Differences of mean decentration and rotation between IOLs were evaluated by the t-Test. BCVA and contrast sensitivity were also measured at the same time gates.
Results:
Mean decentration of Akreos lens was 0.14±0.09mm at 30th day, and 0.13±0.09mm at 100th day. Rotation was 1.6±1.7degrees at 30th day, and 0.7±1.8degrees at 100th day. Mean decentration of AcrySof lens was 0.14±0.07mm at 30th day, and 0.10±0.06mm at 100th day. Mean rotation was negligible at 30th day with standard deviation of 2.1 degrees, and -0.9±3.2degrees at 100th day. Differences of mean decentration as well as mean rotation between the two types of lens were not significant nor at 30th neither 100th day (P>0.05).
Conclusions:
Both lenses assured good stability without significant differences. The developed technique of measurement of IOL stability showed fairly simple, repeatable and reliable.
Keywords: intraocular lens • cataract • imaging/image analysis: clinical