Effect of 1.8-mm Steep-axis Clear Corneal Incision on the Posterior Corneal Astigmatism in Candidates for Toric IOL Implantation

Effect of 1.8-mm Steep-axis Clear Corneal Incision on the Posterior Corneal Astigmatism in Candidates for Toric IOL Implantation

we aimed to analyze the effects of cataract surgery using a 1.8-mm steep-axis clear corneal incision (CCI) on the posterior corneal surfaces based on the keratometry from the rotating Scheimpflug imaging device (Pentacam HR) in candidates for toric intraocular lens (IOL) implantation

Preoperative and at least 1-month postoperative data measured by Pentacam HR were collected in patients for toric IOL implantation. Surgically induced astigmatism on the posterior cornea (P-SIA) was calculated based on the preoperative and postoperative keratometric data, and the related factors of P-SIA were analyzed.

Inclusion Criteria:

1. patients aged at least 45 years old who were scheduled for cataract surgery; (2) regular corneal astigmatism ≥ 1.0 D; (3) the imaging quality parameter (QS) of Pentacam HR was "OK"; and (4) follow-up time ≥1.0 month.

Exclusion Criteria:(1) irregular corneal astigmatism; (2) corneal scar, corneal degeneration, pterygium invading the optic zone; (3) corneal endothelium count<1,000/mm2, corneal endothelial dystrophy, iritis, glaucoma and retinal disease; (4) history of eye surgery, such as corneal refractive surgery, corneal transplantation and retinal surgery; (5) the main incision was expanded or sutures were used during surgery; and (6) some postoperative complications, such as persistent corneal edema, Descemet's membrane detachment and poor wound healing, and any others that might affect the measurement results of the Pentacam HR during the follow-up period.

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