Aniseikonia, Anisometropia and Aniseikonia
Conditions
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
Detailed 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.
Interventions
DIAGNOSTIC_TESTMeasurement of aniseikonia tolerance
Adding sizeglasses of different percent before right and left eye and measure the impact on stereopsis
Sponsors
Glostrup University Hospital, Copenhagen
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
60 Years to 95 Years
Healthy volunteers
Yes
Inclusion criteria
* No previous eye history * cataract grade \<= 1 * visual acuity above 0.8
Exclusion criteria
* lack of cooperation * amblyopia * axial anisometropia * ametropia
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Aniseikonia tolerance | baseline | 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%. |
| Change of Aniseikonia tolerance after surgery | six weeks 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. |
Countries
Denmark
Outcome results
None listed