MedTrace Logo

Exploring the Psychophysics of Keratoconus Using the Moorfields Acuity Chart

NCT02429609 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 80

Last updated 2022-04-12

No results posted yet for this study

Summary

The measurement of visual acuity is made using black letters of varying size superimposed on a uniform white background. The objective is to determine the smallest letter, or optotype, that can be correctly identified. One limitation of current tests is the variability of measurements, this making it difficult for clinicians to determine if changes in visual acuity are related to ocular disease. This variability has been attributed to the design of current optotypes, in particular their differing legibilities. Our group has recently demonstrated that a new type of letter chart (Moorfields Acuity Chart), containing letters with a black core and a white border presented on a grey background, reduces the variability of visual acuity measurements. In this study the investigators wish to determine if changes in vision owing to keratoconus, a disease that causes the cornea to adopt an irregular shape, may be detected more easily using the Moorfields Acuity Chart compared with conventional letter charts.

Conditions

  • Keratoconic Subjects

Interventions

DEVICE

Moorfields Acuity Chart

Sponsors & Collaborators

  • Moorfields Eye Hospital NHS Foundation Trust

    lead OTHER

Study Design

Allocation
NON_RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Max Age
35 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2015-04-15
Primary Completion
2016-04-30
Completion
2016-04-30

More Related Trials

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT02429609 on ClinicalTrials.gov