Effect of suture material on postoperative astigmatism

Area of Science:

• Ophthalmology
• Biomaterials Science
• Surgical Technology

Background:

• Astigmatism is a common visual impairment.
• Surgically induced astigmatism can occur after intraocular lens (IOL) surgery.
• Suture material choice may influence postoperative astigmatism.

Purpose of the Study:

• To compare the effects of different suture materials on surgically induced astigmatism.
• To analyze the decay curves of astigmatism over time.
• To correlate suture characteristics with astigmatism development and resolution.

Main Methods:

• Randomized prospective clinical trial with 200 patients undergoing IOL surgery.
• Comparison of four suture materials: 10-0 nylon, 10-0 polypropylene (Prolene), 11-0 polyester (Mersilene), and 10-0 polyethylene (Novafil).
• Measurement and analysis of induced astigmatism (with-the-rule and against-the-rule) and its decay over two years.

Main Results:

• Mersilene and nylon sutures induced the highest initial with-the-rule (WTR) astigmatism compared to Prolene.
• Nylon sutures showed rapid WTR decay, while Mersilene decayed slowly due to lack of stretchability.
• Prolene had low initial WTR astigmatism but showed against-the-rule (ATR) drift over time.
• Nylon sutures also exhibited a significant ATR shift between one and two years postoperatively.

Conclusions:

• Suture material significantly influences the amount and temporal decay of surgically induced astigmatism after IOL surgery.
• Knot-tying technique and tissue grip affect early astigmatism, while material properties dictate decay curve shape.
• Different sutures lead to distinct astigmatic outcomes, necessitating careful material selection in IOL procedures.