Influence of Trabeculectomy and Phaco-trabeculectomy on Corneal Astigmatism

Not Applicable

• Conditions: Astigmatism; Glaucoma
• Interventions: Device: Biometry; Device: Refraction; Device: Corneal Topography

• Registration Number: NCT02945202
• Lead Sponsor: University of Zurich

Brief Summary

This study investigates the effects of trabeculectomy and combined phacoemulsification plus trabeculectomy on corneal astigmatism.

Detailed Description

Prospectively, consecutive patients at the University Hospital of Zurich undergoing either trabeculectomy (trab) or phaco-trabeculectomy (phaco-trab) are included in this study between January and December 2017. The study interventions takes place 6 months after surgery and include examination of refraction, biometry and corneal topography in order to assess the patient's astigmatism. The values are compared to the preoperative baseline values, which are available from patient records.

Study Timeline

• Status Verified: 2016-10
• Study First Submitted: 2016-10-20
• Study First Submitted QC: 2016-10-25
• Study First Posted: 2016-10-26
• Last Update Submitted: 2016-10-26
• Last Update Posted: 2016-10-27
• Study Start: 2017-01
• Primary Completion: 2017-12
• Study Completion: 2018-02

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 150

Inclusion Criteria

• Trabeculectomy or Phaco-Trabeculectomy between 01/2017 and 12/2017
• Age ≥18 years

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Exclusion Criteria

• Acute or chronic corneal diseases

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
All Eyes	Corneal Topography	All eyes undergo the same interventions. These are the following examinations: Biometry, Refraction and Corneal Topography. The examinations take place 6 months after surgery
All Eyes	Refraction	All eyes undergo the same interventions. These are the following examinations: Biometry, Refraction and Corneal Topography. The examinations take place 6 months after surgery
All Eyes	Biometry	All eyes undergo the same interventions. These are the following examinations: Biometry, Refraction and Corneal Topography. The examinations take place 6 months after surgery

Primary Outcome Measures

Name	Time	Method
Difference in Astigmatism [Diopters (dpt)]	preoperative astigmatism compared to 6 months postoperatively