Prevalence Data for Total Corneal Astigmatism in Cataract Surgery Candidates
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 入组人数
- 11,000
- 试验地点
- 1
- 主要终点
- Abulafia-Koch formula total corneal astigmatism
研究概览
简要总结
The purpose of this study is to report the prevalence data for total corneal astigmatism (TCA) in cataract surgery candidates.
详细描述
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.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Retrospective
入排标准
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Patients who underwent cataract surgery in the Department of Ophthalmology, Peking University Third Hospital from January 2019 to May 2023.
排除标准
- •Incomplete biometric data .
结局指标
主要结局
Abulafia-Koch formula total corneal astigmatism
时间窗: 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
时间窗: 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
时间窗: 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The Barrett toric calculator uses an unpublished mathematical prediction method of TCA based on anterior corneal measurements.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.
次要结局
未报告次要终点