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Relationship between vector distance from corneal apex to thinnest point and unevenness distribution of corneal thickness and the influence of the unevenness on correction of astigmatism by LASIK

Vector analysis of ocular astigmatism: the establishment of a new type of analysis method for astigmatism and the role in prediction and remedy of visual quality descending after excimer laser refractive surgery

Status
Active, not recruiting
Phases
Unknown
Study type
Observational
Source
ChiCTR
Registry ID
ChiCTR-OCC-14004279
Enrollment
Unknown
Registered
2014-01-09
Start date
2014-02-01
Completion date
Unknown
Last updated
2017-04-18

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Ophthalmology

Interventions

low-midrange astigmatism(-0.25D~+2.00D) group and High range astigmatism:LASIK surgery

Sponsors

Zhengzhou University
Lead Sponsor

Eligibility

Sex/Gender
All
Age
18 Years to 50 Years

Inclusion criteria

Inclusion criteria: Aged greater than 18 years; refractive surgery nearly two years in the state basically stable; 2 weeks before surgery did not wear soft contact lenses, 4 weeks not wear hard contact lenses; no history of ocular surgery or trauma; do not use any affect refraction of systemic or local agents.

Exclusion criteria

Exclusion criteria: Younger than 18 years old; refractive surgery nearly two years in a state of instability; surgery two weeks ago to wear soft contact lenses, hard contact lens wearers 4 weeks; history of ocular surgery or trauma; used will affect the refraction of systemic or topical medications.

Design outcomes

Primary

MeasureTime frame
vector Distance from corneal Apex to Thinnest point;absolute error vector;corneal topograph;—

Countries

China

Contacts

Public ContactShulin Wang

Zhengzhou University

eyeswang@163.com+86 13673660870

Outcome results

None listed

Source: ChiCTR (via WHO ICTRP) · Data processed: Feb 4, 2026