A New Measurement of Anseikonia Tolerance

Aniseikonia Clinical Trial

Official title:

Can we Measure Aniseikonia Tolerance in a Normal Population

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT03832335
• Other study ID #: 04127
• Status: Recruiting
• Start date: July 2015
• Est. completion date: December 2020

Study information

• Verified date: February 2019
• Source: Glostrup University Hospital, Copenhagen
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

Population 1:

Measure the effect of size glasses from1-9% on stereopsis

Population 2:

Measure the effect of size glasses from 1-9% on stereopsis in two settings:

• before and after cataract surgery

• after dilation of the eye

Description:

Population 1:

21 eye healthy phakic individuals. Measurements: baseline stereopsis and stereopsis after size glass (1-9%) is added in front of the right eye and in front og the left eye. This measurement provides details on how much size difference a person can endure without impairing stereopsis.

Population 2:

11 phakic eye healthy individuals awaiting cataract operation on both eyes. Measurements are the same as population 1 but this study group is also measured after dilating the eyes. This is to see if accommodation affects the measurement. A postoperative measurement six weeks after cataract operation is also performed to examine if cataract operation affects the measurement.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 31
• Est. completion date: December 2020
• Est. primary completion date: August 2, 2019
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 60 Years to 95 Years

Eligibility

Inclusion Criteria:

• No previous eye history

• cataract grade <= 1

• visual acuity above 0.8

Exclusion Criteria:

• lack of cooperation

• amblyopia

• axial anisometropia

• ametropia

Related Conditions & MeSH terms

• Aniseikonia
• Anisometropia
• Anisometropia and Aniseikonia

Intervention

Diagnostic Test:
• Measurement of aniseikonia tolerance
Adding sizeglasses of different percent before right and left eye and measure the impact on stereopsis

Locations

Country	Name	City	State
Denmark	Rigshospitalet-glostrup	Glostrup	Danmark

Sponsors (1)

Lead Sponsor	Collaborator
Glostrup University Hospital, Copenhagen

Country where clinical trial is conducted

Denmark, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Aniseikonia tolerance	How many percent aniseikonia is tolerated before stereopsis is impaired. Measured by first measuring baseline stereopsis and here after adding aniseikonic (size glass) from 1-9% in front of the right and left eye to measure if stereopsis is impaired. If stereopsis is impaired at 4% sizeglas then aniseikonia tolerance is 4%.	baseline
Primary	Change of Aniseikonia tolerance after surgery	Measurement of aniseikonia tolerance before and after surgery. Measurement: before and after surgery stereopsis is measured, hereafter aniseikonic glasses (size glass) from 1-9% is added in front of the right and left eye to see if stereopsis is impaired. If stereopsis is impaired with 3% aniseikonic glass then the tolerance is 3%. After surgery the measurement is repeated to examine if the aniseikonia tolerance is the same.	six weeks after surgery