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

Status

Completed

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT04924231

Enrollment

Registered

2021-06-11

Start date

2017-02-01

Completion date

2018-05-01

Last updated

2021-06-11

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Cataract

Brief summary

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

Detailed description

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.

Interventions

BEHAVIORALastigmatism

astigamatism at least 1 month after the cataract surgery

Study design

Observational model

CASE_ONLY

Time perspective

RETROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

40 Years to 80 Years

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. \-

Design outcomes

Primary

Measure	Time frame	Description
corneal astigmatism	post 1 month	postoperative anterior, posterior and total corneal astigmatism

Countries

China

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026