Retrospective Observational Study of Posterior Keratometry Measured

Completed

• Conditions: Keratoconus

• Registration Number: NCT04422080
• Lead Sponsor: University Hospital, Montpellier

Brief Summary

Keratoconus is a progressive bilateral disease leading to an apical stromal thinning and an irregular astigmatism by a steepening of the cornea, causing visual impairment. The causes are not yet well known, but it seems to be linked to several comorbidities. Keratoconus is a rare and for a long-time asymptomatic condition and its diagnosis needs meticulous screening for the early stages. Detecting it as soon as possible is a goal as it could lead to earlier avoiding of contributing factors such as eye rubbing and earlier treatment if needed.

The gold standard for keratoconus screening and staging is computerized videotography. It gives information about anterior and posterior corneal bulging, steepening, and thinning. It can be completed by anterior segment optical coherence tomography, which can show corneal scarring. Since recently, some biometry devices can give some information about the posterior corneal keratometry trough swept source optical coherence tomography measures. The measurement of the total corneal power instead of an extrapolation lead to better precision in refractive results after cataract surgery in some cases. It also helped to increase our knowledge about posterior corneal astigmatism. In normal eyes, average posterior corneal astigmatism is 0.37 diopters and against the rule in 91 percent of eyes. There is a correlation between the magnitude of anterior and posterior astigmatism.

In keratoconus eyes, several studies have shown that there is an alignment between axes of the anterior and posterior corneal astigmatism. These studies have been performed on computerized videotopography devices.

The goal of this study was to confirm or deny previous observations about posterior astigmatism in keratoconus eyes, and to assess if the rotation of axis between anterior and posterior astigmatism measured by IOL Master 700® can be a good sign for detection of early stages and fruste keratoconus.

Detailed Description

Not available

Study Timeline

• Study Start: 2019-11-01
• Status Verified: 2020-06
• Primary Completion: 2020-06-01
• Study Completion: 2020-06-03
• Study First Submitted: 2020-06-04
• Study First Submitted QC: 2020-06-04
• Last Update Submitted: 2020-06-04
• Study First Posted: 2020-06-09
• Last Update Posted: 2020-06-09

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 200

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Posterior keratometry	1 day	Posterior cylinder and axis measured on biometry

Secondary Outcome Measures

Name	Time	Method
Total keratometry	1 day	Total corneal power (cylinder and axis) measured on biometrycompleted by the patient

Trial Locations

Locations (1)

UH Montpellier; 🇫🇷 Montpellier, France