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.
Study summary
To analyze the difference between measured total corneal astigmatism and actual corneal astigmatism under different region modes and optimize the region setting.
Eligibility
Sex
ALL
Min age
18 Years
Max age
—
Healthy volunteers
No
Inclusion Criteria:
* 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)
Exclusion Criteria:
* 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°
* Implantation of multifocal IOL
* history of wearing of rigid contact lens within the past 4 weeks or soft contact lens within 1 week;
Primary outcome measure(s)
Vectorial difference — ≥1 month after surgery The vectorial difference between measured corneal astigmatism (under multiple different region mode settings) and actual corneal astigmatism.
pupil size — ≥1 month after surgery pupil size of patients in a bright environment measured by itrace device and MONCV3 device
pupil size 2 — ≥1 month after surgery pupil size of patients measured by Pentacam HR device
residual astigmatism — ≥1 month after surgery residual astigmatism tested by subjective refraction
total corneal astigmatism — ≥1 month after surgery Total corneal astigmatism measured by a scheimpflug tomographer under different region mode settings.
Anterior chamber depth — ≥1 month after surgery The distance between corneal apex and anterior surface of IOL measured by a scheimpflug tomographer
actual corneal astigmatism — ≥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.
This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
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