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Recruiting NCT03299530

Accuracy of Corneal Astigmatism in Different Region Modes

— Observational Astigmatism Cornea

For patients and families

In plain language

An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.

What is being studied
The protocol lists: patients with corneal astigmatism.
Who it may be relevant to
Registry conditions: Astigmatism, Cornea. Basic parameters: from 18 years · All.
What needs checking
Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
Where it takes place
China
Next step
Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →

Unsure about the terms? Read our patient guide →

Overview

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

Interventions

  • Other 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.

Primary outcome measures

  • Vectorial difference [Time frame: ≥1 month after surgery]
  • pupil size [Time frame: ≥1 month after surgery]
  • pupil size 2 [Time frame: ≥1 month after surgery]
  • residual astigmatism [Time frame: ≥1 month after surgery]
  • total corneal astigmatism [Time frame: ≥1 month after surgery]
  • Anterior chamber depth [Time frame: ≥1 month after surgery]
  • actual corneal astigmatism [Time frame: ≥1 month after surgery]

Eligibility criteria

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;

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Observational model
Case-only

Study locations

China · 1 center
  • Eye Hispital of Wenzhou Medical University — Wenzhou

Identifiers

NCT: NCT03299530 · 2017ASTIGMATISM REGIONS

Primary sources (government registries)

View this study on ClinicalTrials.gov ↗