Comparison of two different methods of preoperative marking for toric intraocular lens implantation: bubble marker versus pendulum marker

Farooqui, Javed Hussain; Koul, Archana; Dutta, Ranjan; Shroff, Noshir

doi:10.18240/ijo.2016.05.11

Cited by 11 publications

(7 citation statements)

References 11 publications

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“…Woo et al performed a prospective comparative study to assess the accuracy of three horizontal meridian marks using the iTrace system and found that the average rotational deviation of horizontal marking ranged from −0.66° to 2.2° [ 10 ]. Farooqui et al compared the accuracy of a bubble marker with that of a pendulum marker and found that the mean absolute alignment error for both techniques was similar and less than 3° [ 11 ]. Igarashi et al assessed the horizontal meridian misalignment of limbal marking under a slit-lamp microscope and showed the axis misalignment by an average of 3.4° to 6.9° [ 12 ].…”

Section: Discussionmentioning

confidence: 99%

Three-Random-Point Marking Method for Toric Intraocular Lens Alignment Using the iTrace Aberrometer

Niu

Lin

Qin

et al. 2021

Journal of Ophthalmology

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Purpose. To evaluate the clinical outcome of the three-random-point (TRP) marking method for toric intraocular lens (IOL) alignment using the iTrace aberrometer (Tracey Technologies Corp., Houston, TX). Setting. Department of Ophthalmology, Guangdong Eye Institute, Guangdong Academy of Medical Sciences, Guangdong Provincial People’s Hospital, Guangzhou, China. Design. Prospective, randomized comparative trial. Method. Thirty eyes of 30 patients undergoing cataract surgery with coexisting corneal astigmatism of over 1.0 D were included in this study. All patients were prospectively randomized into the TRP marking group or slit-lamp horizontal meridian (SHM) marking group. TRP marking involved marking three points randomly in the corneal limbus of the patients and accurately marking the horizontal meridian was not required. The follow-up duration was 3 months after cataract surgery. Results. Fifteen eyes of 15 patients were in the TRP marking group and 15 eyes of 15 patients in the SHM marking group. There was no statistically significant difference in BCVA, UDVA, preexisting corneal astigmatism, or residual astigmatism between the groups before or after surgery P > 0.05 . The mean toric IOL misalignment was lesser but without significance in the TRP marking group than in the SHM marking group after 3 postoperative months (2.66° ± 1.42° versus 3.29° ± 1.67°; P = 0.295 ). Conclusion. The TRP marking method using the iTrace aberrometer is simple and accurate for preoperative marking of toric IOLs. It can eliminate the potential systematic errors resulting from varying head positions during the preoperative keratometry measurement and from manual marking.

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Section: Discussionmentioning

confidence: 99%

Three-Random-Point Marking Method for Toric Intraocular Lens Alignment Using the iTrace Aberrometer

Niu

Lin

Qin

et al. 2021

Journal of Ophthalmology

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“…Farooqui et al . [ 6 ] compared the preoperative bubble marker versus the pendulum marker and reported both to be equally comparable, simple, predictable, reproducible, and easy to perform. Popp et al .…”

Section: Discussionmentioning

confidence: 99%

Intraoperative capsular marking for toric intraocular lens placement

Sethi¹,

Naik

2020

Taiwan J Ophthalmol

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“…It is also challenging to identify the true 3- and 9-o’clock positions. Farooqui et al 13 recently described two novel methods for marking the limbus, namely, the “bubble” and the “pendulum”, in an effort to make horizontal marks in proximity to the 3- and 9-o’clock positions. These authors observed an average misalignment of 3° with each of their novel methods; however, we must note the several problems associated with these methods and all methods that use ink to mark the limbus.…”

Section: Discussionmentioning

confidence: 99%

A comparison of three different corneal marking methods used to determine cyclotorsion in the horizontal meridian

Lin¹,

Fang²,

Chuang³

et al. 2017

OPTH

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During toric intraocular lens (IOL) implantation, surgeons must take particular care to ensure that inaccurate preoperative measurement and intraoperative misalignment do not cause unexpected postoperative residual astigmatism. This retrospective, comparative case series study aimed to analyze the rotational deviation, or cyclotorsion, of three corneal marking methods: VERION digital marker (VDM; reference), horizontal slit beam marking (HSBM), and subjective direct visual marking (SDVM) on the table (using a bevel knife tip). Subjects included 81 eyes of 61 patients (mean age: 65.70±13.14 years; range: 32–91 years) undergoing scheduled cataract surgery. A preoperative reference image was taken of each eye. Subsequently, a slit lamp with the light beam turned to the horizontal meridian was used to align the seated patient’s head, and two reference marks were placed at the 3- and 9-o’clock positions of the corneal limbus using a 27-gauge needle and marking pen (HSBM). Upon transfer to the surgical table, the VDM was used to display a real-time dial scale on the patient’s eye, with the entrance of the temporal clear corneal incision (CCI) at 0° (horizontal meridian). Simultaneously, a bevel knife tip was used to create a marker based on the surgeon’s visual determination of the temporal 0° point (SDVM). We used the VDM to quantitatively evaluate the accuracy of axis alignment via deviation from the horizontal reference meridian. Compared with the reference meridian, the SDVM (−3.46°±7.32°, range: −18° to 13°) exhibited greater average relative cyclotorsion versus the HSBM (0.41°±4.92°, range: −10° to 10°). Furthermore, the mean average misalignment was significantly less in the HSBM group versus the SDVM group (t=4.179, P<0.001). The VDM is likely a reliable marking method, similar to the HSBM. In contrast, the SDVM is not entirely reliable. The VDM usage may prevent inaccurate preoperative manual marking during toric IOL implantation.

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Comparison of two different methods of preoperative marking for toric intraocular lens implantation: bubble marker versus pendulum marker

Abstract: Both preoperative marking techniques result in approximately 3 of alignment error. Both marking techniques are simple, predictable, reproducible and easy to perform.

Cited by 11 publications

References 11 publications

Three-Random-Point Marking Method for Toric Intraocular Lens Alignment Using the iTrace Aberrometer

Three-Random-Point Marking Method for Toric Intraocular Lens Alignment Using the iTrace Aberrometer

Intraoperative capsular marking for toric intraocular lens placement

A comparison of three different corneal marking methods used to determine cyclotorsion in the horizontal meridian

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