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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:
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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| 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. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Measurement of aniseikonia tolerance | Diagnostic Test | Adding sizeglasses of different percent before right and left eye and measure the impact on stereopsis |
|
| Measure | Description | Time Frame |
|---|---|---|
| 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 |
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Inclusion Criteria:
Exclusion Criteria:
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group 1: eyehealthy pahkic individuls group 2: eyehalthy phakic patients awainting cataratc surgery
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Rigshospitalet-glostrup | Recruiting | Glostrup Municipality | Danmark | 2600 | Denmark |
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| ID | Term |
|---|---|
| D000839 | Aniseikonia |
| D015858 | Anisometropia |
| ID | Term |
|---|---|
| D012030 | Refractive Errors |
| D005128 | Eye Diseases |
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