Accuracy of Corneal Astigmatism in Different Region Modes

NCT03299530 · tracked via the Priya Life Science China tracker

Sponsor

Wenzhou Medical University

Phase

Observational

Started

2017-10-10

Last updated

2026-08-19

Condition(s) studied

AstigmatismCornea

Investigational drug(s) / intervention(s)

patients with corneal astigmatism

patients with corneal astigmatism: The total corneal astigmatism, anterior chamber depth, will be measured by a Scheimpflug tomographer. Pupil size will be measured by itrace device and MONCV3 device. Residual astigmatism will be tested by subjective refraction.

Study summary

To analyze the difference between measured total corneal astigmatism and actual corneal astigmatism under different region modes and optimize the region setting.

Eligibility

Sex

ALL

Min age

18 Years

Max age

—

Healthy volunteers

Inclusion Criteria: * Age ≥ 18 years * Patients who had received phacoemulsification surgery with or without implantation of toric IOL are with a certain amount of corneal astigmatism. * Best corrected visual acuity ≥ 0.66 (20/30 Snellen) Exclusion Criteria: * Corneal diseases or severe irregular astigmatism (e.g., pterygium, keratoconus), existence of corneal opacification; * Ocular disease which may affect visual acuity (e.g., glaucoma, uveitis, retinal disease, pathologic myopia); * History of ocular surgery or ocular trauma before this cataract surgery; * Decentration of IOL \> 0.3mm or tilt \> 5° * Implantation of multifocal IOL * history of wearing of rigid contact lens within the past 4 weeks or soft contact lens within 1 week;

Primary outcome measure(s)

Vectorial difference — ≥1 month after surgery
The vectorial difference between measured corneal astigmatism (under multiple different region mode settings) and actual corneal astigmatism.
pupil size — ≥1 month after surgery
pupil size of patients in a bright environment measured by itrace device and MONCV3 device
pupil size 2 — ≥1 month after surgery
pupil size of patients measured by Pentacam HR device
residual astigmatism — ≥1 month after surgery
residual astigmatism tested by subjective refraction
total corneal astigmatism — ≥1 month after surgery
Total corneal astigmatism measured by a scheimpflug tomographer under different region mode settings.
Anterior chamber depth — ≥1 month after surgery
The distance between corneal apex and anterior surface of IOL measured by a scheimpflug tomographer
actual corneal astigmatism — ≥1 month after surgery
actual corneal astigmatism is derived from residual astigmatism at corneal plane and cylindrical power of IOL at corneal plane through Holladay 2 formula.

Trial sites (1)

Facility	City	Region	Status
Eye Hispital of Wenzhou Medical University	Wenzhou	Zhejiang	Recruiting

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Other trials for the same condition

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Official registry record

This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.

View NCT03299530 on ClinicalTrials.gov ↗ ← All trials in China