A Study to Determine the Location of the Blind Spot and the Macula-disc Centre Distance on a Fundus Photograph

A Study to Develop Both a Novel Method for Evaluating the True Size of a Retinal Object on Fundus Photographs and a New Reaction-time Based Method for Studying the Visual Field on Healthy Volunteers

Status

Completed

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT01843582

Enrollment

Registered

2013-04-30

Start date

2013-05-31

Completion date

2014-11-30

Last updated

2015-02-27

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Generalized Visual Field Contraction or Constriction

Keywords

Keyword: blind spot

Brief summary

The study is aimed to develop a new reaction-time based method for examining the visual field and to study the effect of refractive error on the magnification of a fundus photograph in order to evaluate the true size of a retinal feature.

Interventions

None listed

Study design

Observational model

CASE_ONLY

Time perspective

CROSS_SECTIONAL

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Yes

Inclusion criteria

* No disease that effect the fundus photograph or visual field

Exclusion criteria

* any disease that effects the fundus photograph or visual field

Design outcomes

Primary

Measure	Time frame	Description
Macula-disc centre distance	one measurement at the start of the study	Measurement is done on a fundus photograph (one visit and one examination for each patient)

Secondary

Measure	Time frame	Description
Location of the blind spot	one measurement at the start of the study	The location of the blind spot is screened using Octopus custom made visual field program at the one visit (one visit and one study for each patient) and a novel reaction-time based visual field device.

Countries

Finland

Outcome results