Controlled reduction of postkeratoplasty astigmatism

Area of Science:

• Ophthalmology
• Corneal Transplantation Surgery
• Refractive Error Correction

Background:

• Post-keratoplasty astigmatism is a common complication following corneal transplantation.
• High degrees of astigmatism can significantly impair visual acuity and patient outcomes.
• Current surgical techniques aim to minimize but often cannot eliminate induced astigmatism.

Observation:

• A surgical technique involving deeply placed interrupted 24-micron sutures and a superficial continuous 16-micron suture was employed in 50 eyes.
• The deeply placed sutures were intentionally cut after surgery in the steepest corneal meridian.
• Keratometry measurements guided the selective cutting of sutures based on central and peripheral readings.

Findings:

• This suture management allowed the donor cornea to achieve its natural shape more rapidly.
• The technique resulted in a significant reduction of induced post-keratoplasty astigmatism, averaging 3.4 diopters.
• Mean visual acuity improved to 20/50 at three months and 20/35 by 11-13 months post-surgery.

Implications:

• This approach offers a method to actively reduce high degrees of astigmatism after corneal transplantation.
• The technique has the potential to improve visual outcomes and patient satisfaction following keratoplasty.
• Further studies may explore modifications to completely eliminate post-keratoplasty astigmatism.