Comparison of Two Toric IOLs with Different Haptic Design: Optical Quality after 1 Year

Abstract

Background The purpose of this prospective, randomised study was to interocularly compare the visual performance after implantation of two different toric IOLs with different haptic design. Methods 59 subjects with corneal astigmatism greater than 1.25 diopter (D) were implanted with an AT TORBI 709M IOL (Carl Zeiss Meditec AG) in one eye and with a Tecnis toric aspheric IOL (Abbot Medical Optics) in the other eye. Observation procedure was performed 12 months postoperatively. Main outcome measures included uncorrected distance visual acuity (UDVA), manifest refraction, IOL rotation, and IOL position. Results Mean UCDVA was 0.04 ± 0.14 logMAR for AT TORBI eyes and 0.06 ± 0.15 logMAR for Tecnis eyes (p = 0.3). The postoperative spherical equivalent values were significantly lower in the AT TORBI group. Mean toric IOL axis rotation was 3.0 ± 2.26 degrees for AT TORBI eyes and 3.27 ± 2.37 for Tecnis eyes (p = 0.5). The mean vertical IOL tilt and vertical decentration values measured with the Visante OCT were significantly larger in the AT TORBI group (p < 0.05). Conclusions Both the Tecnis and the AT TORBI toric IOLs successfully reduced ocular astigmatism. Emmetropia could be better achieved with the AT TORBI IOL, whereas the Tecnis showed better positional stability. This trial is registered with ICMJE NCT03371576.

<p>Evaluating Rotational Stability of an Extended Depth of Focus Toric Intraocular Lens Using a Slit Lamp and Image-Based Analysis</p>

“…Another, using slit lamp observation, found a mean absolute rotation of 3.3 degrees between the day of surgery and 12 months postoperative. 11 The results from the current study appear slightly better than this. Again, the use of Day 1 data as the baseline may be a factor in this regard.…”

“…13 Marques et al 14 examined the results with a Tecnis multifocal toric lens (Tecnis Multifocal Toric ZMT 150-400; Johnson and Johnson Vision, Santa Ana, CA) and noted an average rotation of about 3 degrees at 1 and 6 months; 1.6% (1/60 eyes) required repositioning due to IOL rotation of 12 degrees and 100% had IOL rotation <10 degrees; these results are similar to toric monofocal lens findings with the same material. 6,[9][10][11] Results in the current study show a significantly higher percentage of lenses rotating less than 5 degrees than was reported for the same IOL in an earlier, smaller study (97% vs 89% at 3 months). However, the earlier study was based on orientation evaluated using a tomography system.…”

“… 13 Marques et al 14 examined the results with a Tecnis multifocal toric lens (Tecnis Multifocal Toric ZMT 150–400; Johnson and Johnson Vision, Santa Ana, CA) and noted an average rotation of about 3 degrees at 1 and 6 months; 1.6% (1/60 eyes) required repositioning due to IOL rotation of 12 degrees and 100% had IOL rotation <10 degrees; these results are similar to toric monofocal lens findings with the same material. 6 , 9 - 11 …”

Effect of haptic geometry in C-loop intraocular lenses on optical quality

“…The ISO (11979-3:2012) specifies requirements and test methods for certain mechanical properties of IOLs intended for capsular bag placement. The mechanical properties are essential to guarantee a good stability inside the capsular bag avoiding decentration, axial displacement, tilt or rotation that affect the visual performances after cataract surgery (Garzón et al, 2015;Miháltz et al, 2018). The main goal of this study was to design an aberration-free spherical IOL and to study the influence of haptic geometry on the optical quality.…”

“…Intraocular lens stability depends on some factors such as: capsulorhexis size (Nagy et al, 2011), IOL diameters versus capsular bag diameter (Vounotrypidis et al, 2018), IOL material properties (Chua et al, 2012;Bozukova et al, 2013), and above all, haptic design (Wirtitsch et al, 2004;Crnej et al, 2011;Choi et al, 2018). The main function of the haptics is to offer proper positional stability, avoiding tilt, decentration, or rotation of the optic (Garzón et al, 2015;Miháltz et al, 2018). There are different haptics designs which depend on the * Correspondence to: Calle María de Luna, 50018, Edificio Betancourt, University of Zaragoza, Spain.…”