Homonymous Congruence Analysis

Menu: Image > Congruence Analysis
Context menu: Congruence Analysis

This display shows the congruence (symmetry) between right and left visual field. Both visual fields are superimposed without mirroring (homonymous). At each point the difference RIGHT-LEFT field is calculated


Right image: difference value as number. Positive number = value (defect depth) better on the right eye

Left image: compound of 2 Color Defect Maps from the right and left eye. Dependent on the difference, various geometrical patterns are shown:

VERTICAL stripes: difference positive, values better on the right and worse on the left eye

HORIZONTAL stripes: difference negative, values worse on the right eye

UNIFORM areas: mimimal difference between right and left, defect depth in the same color shade class

Basis

Result

CONCLUSION: This image shows the symmetry between right and left visual field. The evaluation is intuitive driven by the continuous, colored and patterned style. The contrast shows the amount of difference. This image helps in dignostics.


Further information

With normal visual fields, both blind spots show as incongruent, striped areas

Only matching points are superimposed. In case of asymmetric patterns, e.g. Octopus G1, some points are omitted