A New Measurement of Anseikonia Tolerance

Can we Measure Aniseikonia Tolerance in a Normal Population

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

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.

Inclusion Criteria:

• No previous eye history
• cataract grade <= 1
• visual acuity above 0.8

Exclusion Criteria:

• lack of cooperation
• amblyopia
• axial anisometropia
• ametropia