Clinical Outcomes of Steep-Axis One-Handed Phacoemulsification under the Guidance of a Verion Image-Guided System

Abstract

Purpose. To compare the efficiency and safety of steep-axis one-handed phacoemulsification with steep-axis two-handed phacoemulsification.Patients and Methods. Patients with cataracts underwent steep-axis one-handed (steep-axis one-handed group) or steep-axis two-handed (steep-axis two-handed group) phacoemulsification with a 2.4 mm clear corneal incision (CCI) under the guidance of the Verion Image-Guided System. Intraoperative phacoparameters, such as visual acuity, surgically induced astigmatism (SIA), total corneal astigmatism (TCA), angle of error (AE), corneal volume (CV), and corneal endothelial cells, were compared.Results. There were no significant differences in the intraoperative phacoparameters between the two groups. The visual outcomes were significantly better in the steep-axis one-handed group than in the two-handed group at 1 week postoperatively (allp<0.05) but not at 1 month and 3 months postoperatively. TCAs were significantly decreased in both groups at 1 and 3 months postoperatively (allp<0.05). There were no significant differences at any follow-up points in both groups (allp<0.001). At 3 months postoperatively, the SIA was 0.95 ± 0.44 D in the steep-axis one-handed group and 1.01 ± 0.50 D in the steep-axis two-handed group; there was no significant difference between the groups. The AE was 39.45 ± 26.53° in the steep-axis one-handed group and 49.75° ± 26.23° in the steep-axis two-handed group, which were significantly different (p=0.005). Endothelial cell loss was significantly lower in the steep-axis one-handed group than that in the steep-axis two-handed group at all follow-up points (allp<0.05).Conclusions. Both the steep-axis one-handed and the steep-axis two-handed techniques could significantly decrease TCA. Compared with the steep-axis two-handed technique, the steep-axis one-handed technique has the advantage of decreasing the AE and reducing trauma to the cornea in soft-to-moderate nuclei.

Repeatability of OPD-Scan III and its agreement with Pentacam in measuring keratometry, astigmatism and axis in patients with cataract and moderate to high astigmatism

“…This cross-sectional study comprised patients with cataract and moderate to high astigmatism who received ophthalmologic measurement at the Department of Ophthalmology, Lixiang Eye Hospital of Soochow University, Jiangsu, China, from May 2018 to September 2019. The inclusion criteria included the following: (1) the patient could smoothly complete OPD-Scan III and Pentacam examinations; (2) regular astigmatism of more than 0.75 D;. The exclusion criteria included the following: (1) keratoconus, corneal scar and other corneal diseases; and (2) history of dry eyes, eye trauma, eye surgery, etc.…”

“…Currently, cataract surgery has entered the era of refractive surgery, and the intraoperative correction of corneal astigmatism is a necessary requirement for refractive cataract surgery (RCS) [1]. The precise measurement of keratometry, corneal astigmatism and axis is signi cant in planning RCS, such as identifying the location and with of the clear corneal incision(CCI) [2,3],and calculating the type and axis of Toric intraocular lens (IOL) [4,5]. In addition, calculating the power of IOL power also depend on keratometry [ 6] .At present, there are many devices for measuring keratometry in clinical practice, such as Pentacam, IOL-Master, VERION and so on.…”

Managing low corneal astigmatism in patients with presbyopia correcting intraocular lenses: a narrative review

“…However, most of the studies collected use a size between 2.2 and 3.5 mm (Table 1 ). The arithmetic difference between the preoperative and postoperative corneal astigmatism was below 0.5 D in the 13 retrieved studies, with only three studies (23%) reporting a difference greater than or equal to 0.3 D [ 50 – 52 ]. Furthermore, only one study reported the percentage of subjects achieving postoperative refractive astigmatism in 0.25 D (34%), 0.50 D (56%), 0.75 D (72%), and 1 D (91%).…”