NCT02687022

Measurement Repeatability in Contemporary Aberrometry

A Comparative Study of Measurement Repeatability for Two Aberrometers

• Status: Unknown
• Phase: N/A
• Study type: Interventional
• Enrollment: 60 (estimated)
• Sponsor: Moorfields Eye Hospital NHS Foundation Trust · Academic / Other
• Sex: All
• Age: 21 Years – 60 Years
• Healthy volunteers: Not accepted

Summary

Wavefront scans are a common form of diagnostic test applied in preparing patients for laser eye surgery. An optical map of the eye is created by wavefront scanning, and information from these maps is used to program lasers used to correct focusing errors in the eye. Here the investigators are comparing how repeatable measurements are with a new wavefront scanner and one that is already in widespread use.

Detailed description

Aberrometers are used to measure each element of defocus (aberration) in an optical system. In LASIK, information derived from aberrometry (scans performed using aberrometers) is used to program the pattern of laser pulses delivered by an excimer laser in therapeutic reshaping of the cornea to correct defocus. To do this accurately, aberrometry findings need to be repeatable and correspond closely to manifest refraction. Here the investigators compare repeatability of measurements for a new aberrometer (Peramis) versus the aberrometer most widely used in contemporary wavefront guided laser vision correction (iDesign). The test aberrometer will be: Peramis (Schwind Eye-tech Solutions, Kleinostheim, Germany). Control aberrometer will be: iDesign (AMO, Santa Clara, CA)

Conditions

• Refractive Errors

Interventions

Type	Name	Description
DEVICE	Peramis aberrometry	A non-invasive photographic scan sequence acquired in under 10 seconds
DEVICE	iDesign aberrometry	A non-invasive photographic scan sequence acquired in under 10 seconds

Timeline

• Start date: 2016-03-01
• Primary completion: 2016-06-01
• Completion: 2016-09-01
• First posted: 2016-02-22
• Last updated: 2016-02-22