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Total Corneal Astigmatism Prevalence in Cataract Patients

Sponsor
Peking University Third Hospital (Other)
Overall Status
Not yet recruiting
CT.gov ID
NCT06148857
Collaborator
(none)
11,000
Enrollment
1
Location
30
Anticipated Duration (Days)
11160.4
Patients Per Site Per Month

Study Details

Study Description

Brief Summary

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

Condition or Disease Intervention/Treatment Phase
  • Diagnostic Test: IOLMaster 700

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 Design

Study Type:
Observational
Anticipated Enrollment :
11000 participants
Observational Model:
Cohort
Time Perspective:
Retrospective
Official Title:
Prevalence Data for Total Corneal Astigmatism in Cataract Surgery Candidates
Anticipated Study Start Date :
Nov 1, 2023
Anticipated Primary Completion Date :
Nov 1, 2023
Anticipated Study Completion Date :
Dec 1, 2023

Outcome Measures

Primary Outcome Measures

  1. total keratometric astigmatism [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.

  2. Abulafia-Koch formula total corneal astigmatism [At Enrollment]

    The AK formula, described by Abulafia et al, is a regression formula that calculates an estimated TCA using K astigmatism.

  3. Barrett toric calculator total corneal astigmatism [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    The Barrett toric calculator uses an unpublished mathematical prediction method of TCA based on anterior corneal measurements.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.

Eligibility Criteria

Criteria

Ages Eligible for Study:
N/A and Older
Sexes Eligible for Study:
All
Accepts Healthy Volunteers:
No
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 .

Contacts and Locations

Locations

Site City State Country Postal Code
1 Peking University Third Hospital Beijing Beijing China 100191

Sponsors and Collaborators

  • Peking University Third Hospital

Investigators

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

Study Documents (Full-Text)

None provided.

More Information

Publications

None provided.
Responsible Party:
Peking University Third Hospital
ClinicalTrials.gov Identifier:
NCT06148857
Other Study ID Numbers:
  • BLB2
First Posted:
Nov 28, 2023
Last Update Posted:
Nov 28, 2023
Last Verified:
Nov 1, 2023
Individual Participant Data (IPD) Sharing Statement:
No
Plan to Share IPD:
No
Studies a U.S. FDA-regulated Drug Product:
No
Studies a U.S. FDA-regulated Device Product:
No
Keywords provided by Peking University Third Hospital
cataract
astigmatism
prevalence
Additional relevant MeSH terms:
Cataract
Astigmatism

Study Results

No Results Posted as of Nov 28, 2023