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) ]
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