Rotational slit-beam marking: an advanced manual corneal astigmatic marking method for toric intraocular lens implantati
- PDF / 677,858 Bytes
- 11 Pages / 547.087 x 737.008 pts Page_size
- 28 Downloads / 206 Views
(0123456789().,-volV) ( 01234567 89().,-volV)
ORIGINAL PAPER
Rotational slit-beam marking: an advanced manual corneal astigmatic marking method for toric intraocular lens implantation Qianru Wu . Yinan Liu . Hongyuan Cai . Chun Zhang . Xiaoyong Chen
Received: 28 January 2020 / Accepted: 25 June 2020 Ó Springer Nature B.V. 2020
Abstract Purpose To evaluate the accuracy of an advanced manual corneal astigmatic marking method for toric intraocular lens (IOL) implantation. Methods From 52 patients, 52 eyes with cataracts and corneal astigmatism were included. The target axis of the toric IOL was marked with the new manual marking method preoperatively and with the Zeiss CALLISTO Eye image-guided system intraoperatively. For the manual method, a slit-lamp with a minimum rotation angle of 5 degrees was used and rotated to the meridian of the toric IOL and incision axes. The relative rotational and vertical deviation of the IOL and incision axes were measured using the digital marker as a reference. Results There was no significant difference between the manually marked IOL axis (100.9° ± 65.62°) and the digital mark (100.8° ± 65.76°; P = 0.771). The absolute values of the relative rotational and vertical deviations of the manually marked IOL axis were small, at 2.03° ± 1.44° and 0.46 ± 0.43 mm,
respectively. There was no significant difference between the manually marked corneal incision and the digital meridian (P = 0.179). Then, patients were classified into three groups based on the type of astigmatism they had. There was no significant difference in mean absolute deviation among the groups (P = 0.112). The manual incision mark had a relative rotational deviation of 1.65° ± 1.44°. The vertical misalignment of the manually marked incision axis was 0.27 ± 0.30 mm. Conclusion Rotational slit-beam marking could be an effective and convenient marking method for toric IOL implantation. This method could be a potential alternative in underdeveloped areas where digital image-guided systems are not available. Keywords Cataract Astigmatism Toric intraocular lens Corneal astigmatic marking method
Introduction Qianru Wu and Yinan Liu have contributed equally to this work. Q. Wu Y. Liu H. Cai C. Zhang X. Chen (&) Department of Ophthalmology, Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, People’s Republic of China e-mail: [email protected]
With the increasing demand for visual quality, cataract surgery has entered the era of refractive surgery instead of blindness prevention. Among all cataract patients, approximately 35% to 40% have astigmatism above 1 D [1, 2], of which 25% of cases are astigmatism with the rule (WTR) and 58% are against the rule (ATR) [3]. Corneal astigmatism can be
123
Int Ophthalmol
corrected during cataract surgery by implantation of a toric intraocular lens (IOL), which provides patients with optimum distance vision and spectacle independence postoperatively [4, 5]. Successful imp
Data Loading...
