Total Corneal Astigmatism Prevalence in Cataract Patients

November 20, 2023 updated by: Peking University Third Hospital

Prevalence Data for Total Corneal Astigmatism in Cataract Surgery Candidates

The purpose of this study is to report the prevalence data for total corneal astigmatism (TCA) in cataract surgery candidates.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

The purpose of this retrospective study is to report the prevalence data for total corneal astigmatism (TCA) in cataract surgery candidates. Preoperative biometric data of all the patients who underwent cataract surgery in the Department of Ophthalmology, Peking University Third Hospital, from January 2019 to May 2023, were collected and analyzed. Data sets with incomplete biometric data were excluded.

Study Type

Observational

Enrollment (Estimated)

11000

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • China
    • Beijing
      • Beijing, Beijing, China, 100191
        • Peking University Third Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

All the patients who underwent cataract surgery in the Department of Ophthalmology, Peking University Third Hospital from January 2019 to May 2023.

Description

Inclusion Criteria:

  • Patients who underwent cataract surgery in the Department of Ophthalmology, Peking University Third Hospital from January 2019 to May 2023.

Exclusion Criteria:

  • Incomplete biometric data .

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
total keratometric astigmatism
Time Frame: At Enrollment
Total keratometry is calculated based on the anterior and posterior corneal surface radius and CCT using the thick lens formula with the actual indices of refractions for air (1.000), cornea (1.376), and aqueous (1.336) by IOLMaster 700. Total keratometric astigmatism is taken as the TCA measured by IOLMaster 700.
At Enrollment
Abulafia-Koch formula total corneal astigmatism
Time Frame: At Enrollment
The AK formula, described by Abulafia et al, is a regression formula that calculates an estimated TCA using K astigmatism.
At Enrollment
Barrett toric calculator total corneal astigmatism
Time Frame: At Enrollment
The Barrett toric calculator uses an unpublished mathematical prediction method of TCA based on anterior corneal measurements. AL, ACD, LT, WTW, and K data by IOLMaster 700 were input into the Barrett toric calculator. The target refraction, incision surgically induced astigmatism (SIA), and incision location were all set as 0. The output net astigmatism was recorded as TCA predicted by the Barrett toric calculator.
At Enrollment

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Peking University Third Hospital

Investigators

  • Principal Investigator: Hong Qi, Dr., Peking University Third Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

November 1, 2023

Primary Completion (Estimated)

November 1, 2023

Study Completion (Estimated)

December 1, 2023

Study Registration Dates

First Submitted

November 20, 2023

First Submitted That Met QC Criteria

November 20, 2023

First Posted (Actual)

November 28, 2023

Study Record Updates

Last Update Posted (Actual)

November 28, 2023

Last Update Submitted That Met QC Criteria

November 20, 2023

Last Verified

November 1, 2023

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • BLB2

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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