A New Measurement of Anseikonia Tolerance
Can we Measure Aniseikonia Tolerance in a Normal Population
1 other identifier
observational
31
1 country
1
Brief 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
Trial Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at below P25 for all trials
Started Jul 2015
Longer than P75 for all trials
1 active site
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
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Study Timeline
Key milestones and dates
Study Start
First participant enrolled
July 1, 2015
CompletedFirst Submitted
Initial submission to the registry
January 31, 2019
CompletedFirst Posted
Study publicly available on registry
February 6, 2019
CompletedPrimary Completion
Last participant's last visit for primary outcome
August 2, 2019
CompletedStudy Completion
Last participant's last visit for all outcomes
December 1, 2020
CompletedFebruary 6, 2019
February 1, 2019
4.1 years
January 31, 2019
February 4, 2019
Conditions
Outcome Measures
Primary Outcomes (2)
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
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
Study Arms (2)
Phakic group
21 eyehealthy individuals examined for baseline stereopsis and impact of aniseikonia on stereopsis. An non-invasive measurement.
Cataract group
11 patients awaiting cataract surgery on both eyes. Measurement of baseline stereopsis and impact of artificial induced aniseikonia on stereopsis. A non invasive measurement that are repeated after dilatation of the eyes and again six weeks after surgery.
Interventions
Adding sizeglasses of different percent before right and left eye and measure the impact on stereopsis
Eligibility Criteria
group 1: eyehealthy pahkic individuls group 2: eyehalthy phakic patients awainting cataratc surgery
You may qualify if:
- No previous eye history
- cataract grade \<= 1
- visual acuity above 0.8
You may not qualify if:
- lack of cooperation
- amblyopia
- axial anisometropia
- ametropia
Contact the study team to confirm eligibility.
Sponsors & Collaborators
Study Sites (1)
Rigshospitalet-glostrup
Glostrup Municipality, Danmark, 2600, Denmark
MeSH Terms
Conditions
Condition Hierarchy (Ancestors)
Study Design
- Study Type
- observational
- Observational Model
- COHORT
- Time Perspective
- PROSPECTIVE
- Sponsor Type
- OTHER
- Responsible Party
- PRINCIPAL INVESTIGATOR
- PI Title
- Principal investigator
Study Record Dates
First Submitted
January 31, 2019
First Posted
February 6, 2019
Study Start
July 1, 2015
Primary Completion
August 2, 2019
Study Completion
December 1, 2020
Last Updated
February 6, 2019
Record last verified: 2019-02
Data Sharing
- IPD Sharing
- Will not share