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Macular translocation surgery: computer simulation of visual perception
1St. Paul's Eye Unit, Royal Liverpool University Hospital Trust, Liverpool L7 8XP, UK.
Summary
Macular translocation surgery can cause visual distortions. Computer analysis of pre- and post-operative images reveals significant retinal changes, explaining post-surgery visual issues and eye suppression.
Area of Science:
- Ophthalmology
- Computational Imaging
- Retinal Surgery
Background:
- Macular translocation surgery aims for visual improvement but often leads to patient confusion and diplopia.
- High incidence of eye suppression is observed post-surgery.
- Understanding post-operative visual perception is crucial.
Purpose of the Study:
- To analyze pre- and post-operative fundal images using computer software.
- To investigate how patients perceive vision after macular translocation surgery.
- To model the visual effects of macular translocation.
Main Methods:
- Developed a graphical user interface for landmark identification in fundal images.
- Applied bilinear and thin-plate spline transformations for image interpolation.
- Utilized the Mona Lisa as a test image to visualize surgical effects.
Main Results:
- Both algorithms approximated surgical effects on the retina.
- Bilinear transformation modeled whole-retina changes (rotation, shear, etc.).
- Thin-plate spline accounted for regional, uneven retinal distortions, causing warped test images.
Conclusions:
- Confirmed neurosensory redistribution in macular translocation (MT360).
- Post-surgery, corresponding retinal elements no longer align between eyes.
- Image distortion in the operated eye, uncorrected by squint surgery, likely causes eye suppression.
