Influence of Different Needle Insertion Positions on the Clinical Efficacy of Suture-Fixated Transscleral IOL Implantation Without Knots

Sun Yat-sen University

Status: Not yet enrolling

Conditions: Congenital Ectopia Lentis

Treatments: Procedure: Transscleral Suture-Fixated Intraocular Lens Implantation (Suture Needle Insertion at 2.5 mm Posterior to the Limbus)

Study type: Interventional

Funder types: Other

Identifiers

NCT07252349

2025KYPJ136

Details and patient eligibility

About

This is a single-blind, single-center, parallel-group randomized controlled trial with the following objectives: First, researchers aim to compare the clinical efficacy of 2mm and 2.5mm post-limbal needle insertion in sutureless transscleral IOL fixation for patients with congenital ectopia lentis. Second, the goal is to investigate the mean absolute refractive prediction error, IOL tilt and decentration, uncorrected visual acuity (UCVA), best-corrected visual acuity (BCVA), and corneal endothelial cell count at 3 months postoperatively. Third, it intends to explore the incidence of postoperative complications of the two needle insertion positions in this specific surgical method. Finally, this study aims to provide evidence for ophthalmic clinical practice, explore the optimal needle insertion point, and offer more precise and safe surgical plans for patients requiring sutureless transscleral IOL fixation.

Full description

This is a professional translation conforming to medical academic writing standards (with unified key terms and specified abbreviation as required):

For patients with insufficient capsular bag support due to congenital developmental abnormalities, trauma, or other reasons, who have indications for intraocular lens (IOL) implantation, IOL suspension surgery is the main surgical method. Sutureless transscleral IOL fixation is one of the commonly used IOL suspension surgeries currently. Compared with traditional transscleral suture fixation, sutureless transscleral IOL fixation can effectively reduce suture-related complications while ensuring safety and effectiveness, with higher surgical safety.

In transscleral IOL fixation, previous studies have commonly used 2mm and 2.5mm post-limbal positions as needle insertion sites. The 2.5mm post-limbal needle insertion point has a smaller mean absolute refractive prediction error and better clinical efficacy postoperatively. As an IOL suspension surgery, differences in needle insertion positions may affect postoperative refractive status, IOL stability, visual outcomes, and other parameters. Although existing literature has evaluated the overall clinical efficacy and safety of sutureless transscleral IOL fixation, to date, no study has systematically compared the clinical efficacy of this commonly used IOL suspension surgery at different needle insertion positions. Therefore, evaluating the impact of different needle insertion positions on surgical outcomes is crucial for optimizing surgical strategies and improving treatment precision.

In this randomized controlled trial, the investigators will systematically investigate the clinical efficacy of 2mm and 2.5mm post-limbal needle insertion points in sutureless transscleral IOL fixation. Through this study, the investigators aim to provide evidence for ophthalmic clinical practice, explore the optimal needle insertion point, and offer more precise and safe surgical plans for patients requiring sutureless transscleral IOL fixation.

Enrollment: 54 estimated patients

Sex: All

Ages: 4 to 18 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Patients aged 4-18 years (regardless of gender) who meet the indications for transscleral suture-fixated intraocular lens implantation
2. Patients who can complete a follow-up period of at least 3 months after surgery;
3. Patients or their legal guardians who provide informed consent to participate in this study.

Exclusion criteria

1. Patients with concurent secondary qlaucoma, retinal detachment, strabismus, or other relevant ocular complications (excludingrefractive errors);
2. Patients participating in other trials that may affect the results of this study.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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54 participants in 2 patient groups

intervention group

Experimental group

Description:

Participants in the intervention group should complete a comprehensive ophthalmic examination at baseline, undergo needle insertion 2.5mm post-limbal during surgery, and receive routine follow-up at 1 week, 1 month, and 3 months postoperatively.

Treatment:

Procedure: Transscleral Suture-Fixated Intraocular Lens Implantation (Suture Needle Insertion at 2.5 mm Posterior to the Limbus)

compare group

No Intervention group

Description:

Participants in the intervention group should complete a comprehensive ophthalmic examination at baseline, undergo needle insertion 2mm post-limbal during surgery, and receive routine follow-up at 1 week, 1 month, and 3 months postoperatively.