Can we Measure Aniseikonia Tolerance in a Normal Population
试验速览
- 阶段
- 不适用
- 发起方
- 入组人数
- 31
- 试验地点
- 1
- 主要终点
- Aniseikonia tolerance
研究概览
简要总结
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
详细描述
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.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 年龄范围
- 60 Years 至 95 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •No previous eye history
- •cataract grade <= 1
- •visual acuity above 0.8
排除标准
- •lack of cooperation
- •amblyopia
- •axial anisometropia
- •ametropia
结局指标
主要结局
Aniseikonia tolerance
时间窗: 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
时间窗: 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.
次要结局
未报告次要终点
研究者
Therese Krarup
Principal investigator
Glostrup University Hospital, Copenhagen