Total Corneal Astigmatism Prevalence in Cataract Patients

Not yet recruiting

• Conditions: Cataract

• Registration Number: NCT06148857
• Lead Sponsor: Peking University Third Hospital

Brief Summary

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

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 Timeline

• Status Verified: 2023-11
• Study Start: 2023-11
• Primary Completion: 2023-11
• Study First Submitted: 2023-11-20
• Study First Submitted QC: 2023-11-20
• Last Update Submitted: 2023-11-20
• Study First Posted: 2023-11-28
• Last Update Posted: 2023-11-28
• Study Completion: 2023-12

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 11000

Inclusion Criteria

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

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Exclusion Criteria

• Incomplete biometric data .

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
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.
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.
Barrett toric calculator total corneal astigmatism	At Enrollment	The Barrett toric calculator uses an unpublished mathematical prediction method of TCA based on anterior corneal measurements.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.

Trial Locations

Locations (1)

Peking University Third Hospital; 🇨🇳 Beijing, Beijing, China