Accuracy of Corneal Astigmatism in Different Region Modes
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|ClinicalTrials.gov Identifier: NCT03299530|
Recruitment Status : Recruiting
First Posted : October 3, 2017
Last Update Posted : November 27, 2018
|Condition or disease||Intervention/treatment|
|Astigmatism Cornea||Other: patients with corneal astigmatism|
|Study Type :||Observational|
|Estimated Enrollment :||70 participants|
|Official Title:||Accuracy of Corneal Astigmatism in Different Region Modes|
|Actual Study Start Date :||October 10, 2017|
|Estimated Primary Completion Date :||February 10, 2019|
|Estimated Study Completion Date :||February 28, 2019|
patients with corneal astigmatism
Patients who had received phacoemulsification surgery with or without implantation of toric IOL are with a certain amount of corneal astigmatism.
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.
- Vectorial difference [ Time Frame: ≥1 month after surgery ]The vectorial difference between measured corneal astigmatism (under multiple different region mode settings) and actual corneal astigmatism.
- pupil size [ Time Frame: ≥1 month after surgery ]pupil size of patients in a bright environment measured by itrace device and MONCV3 device
- pupil size 2 [ Time Frame: ≥1 month after surgery ]pupil size of patients measured by Pentacam HR device
- residual astigmatism [ Time Frame: ≥1 month after surgery ]residual astigmatism tested by subjective refraction
- total corneal astigmatism [ Time Frame: ≥1 month after surgery ]Total corneal astigmatism measured by a scheimpflug tomographer under different region mode settings.
- Anterior chamber depth [ Time Frame: ≥1 month after surgery ]The distance between corneal apex and anterior surface of IOL measured by a scheimpflug tomographer
- actual corneal astigmatism [ Time Frame: ≥1 month after surgery ]actual corneal astigmatism is derived from residual astigmatism at corneal plane and cylindrical power of IOL at corneal plane through Holladay 2 formula.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03299530
|Contact: AYong Yu, MD.PhD.||+email@example.com|
|Contact: Xu Shao, MDfirstname.lastname@example.org|
|Eye Hispital of Wenzhou Medical University||Recruiting|
|Wenzhou, Zhejiang, China, 325000|
|Principal Investigator:||AYong Yu, MD.PhD.||Wenzhou Medical University|