Accuracy of Corneal Astigmatism in Different Region Modes
Trial statusRecruiting
Trial phaseNot listed
Trial typeObservational
Biological sexAll
Age18+
SponsorWenzhou Medical University
About this trial
To analyze the difference between measured total corneal astigmatism and actual corneal astigmatism under different region modes and optimize the region setting.
Eligibility criteria
This trial does not accept healthy volunteersQualifiers
Age ≥ 18 years
Patients who had received phacoemulsification surgery with or without implantation of toric IOL are with a certain amount of corneal astigmatism.
Best corrected visual acuity ≥ 0.66 (20/30 Snellen)
Disqualifiers
Corneal diseases or severe irregular astigmatism (e.g., pterygium, keratoconus), existence of corneal opacification;
Ocular disease which may affect visual acuity (e.g., glaucoma, uveitis, retinal disease, pathologic myopia);
History of ocular surgery or ocular trauma before this cataract surgery;
Decentration of IOL > 0.3mm or tilt > 5°
Trial population
Patients who received cataract surgery in The Eye Hospital of Wenzhou Medical University
Trial design
Design model
Case-only
Time perspective
Cross-sectional
Treatments tested in this trial
patients with corneal astigmatism
Other interventionThe 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.
Treatment groups
70 Participants
are divided into 1 treatment groupGroup A: patients with corneal astigmatism1 intervention
Trial outcomes
Primary outcomes
1
Vectorial difference
The vectorial difference between measured corneal astigmatism (under multiple different region mode settings) and actual corneal astigmatism.
Time frame
≥1 month after surgery2
pupil size
pupil size of patients in a bright environment measured by itrace device and MONCV3 device
Time frame
≥1 month after surgery3
pupil size 2
pupil size of patients measured by Pentacam HR device
Time frame
≥1 month after surgery4
residual astigmatism
residual astigmatism tested by subjective refraction
Time frame
≥1 month after surgerySponsors and contacts
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Source ClinicalTrials.gov