Clinical Trial: Prevalence of Corneal Astigmatism Before Glaucoma Surgery in Chinese Patients With Primary Angle-closure Glaucoma

Study Status: Not yet recruiting
Recruit Status: Not yet recruiting
Study Type: Observational

Official Title: Prevalence of Corneal Astigmatism Before Glaucoma Surgery in Chinese Patients With Primary Angle-closure Glaucoma

Brief Summary: Effectiveness of early lens extraction for the treatment of primary angle-closure glaucoma has been reported last year. We intend to make biometry examination for Chinese patients with primary angle-closure glaucoma, to obtain keratometry (K) , axial length (AL) and so on, and demographics data will also be recorded. We will study the prevalence of corneal astigmatism before glaucoma surgery in Chinese patients with primary angle-closure glaucoma. Furthermore, differences of corneal astigmatism between primary angle-closure glaucoma and cataract patients will be explored. Finally, the prevalence of corneal astigmatism before glaucoma surgery in Chinese patients with angle-closure glaucoma will be portrayed and can be instructive to the production of intraocular lens.

Detailed Summary:

Biometry examination contains keratometry (K) , axial length (AL), central anterior chamber depth, visual field loss(mean deviation, MD), choroidal thickness(CT), range of goniosynechia, and disease course.

Demographics data contains age, gender, and eye.


Sponsor: Mingkai Lin

Current Primary Outcome: Prevalence of corneal astigmatism [ Time Frame: During preoperative screening (1 day) ]

Data of corneal astigmatism will be acquired through examination,and different types of corneal astigmatism will be diagnosed and seperated.Moreover,we will analyse the prevalence of corneal astigmatism,and compare among different age groups and different genders.Correlation between demographic features and data will be analysed,too.


Original Primary Outcome: Same as current

Current Secondary Outcome:

  • Prevalence of keratometry [ Time Frame: During preoperative screening (1 day) ]
    Flat,steep and mean keratometry will be examined before glaucoma surgery. Moreover,we will analyse the prevalence of corneal astigmatism,and compare among different age groups and different genders.
  • Prevalence of axial length [ Time Frame: During preoperative screening (1 day) ]
    Axial length will be measured by both IOL Master and A-scan, and data will be compared between different measurements,different genders and different age groups.


Original Secondary Outcome: Same as current

Information By: Zhongshan Ophthalmic Center, Sun Yet-san University

Dates:
Date Received: May 17, 2017
Date Started: June 1, 2017
Date Completion: August 31, 2017
Last Updated: May 18, 2017
Last Verified: May 2017