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Scope of super-resolution in central vision
  1. Lars Frisén*
  1. 1 University of Gothenburg, Sweden
  1. Correspondence to: Lars Frisen, Clinical Neuroscience, Sahlgren's University Hospital, Neuro-ophthalmology, Blue Street 7:5, SU/S, Goteborg, SE-413 45, Sweden; lars.frisen{at}neuro.gu.se

Abstract

Background: Super-resolution refers to computational enhancement of detail in sets of similar images, particularly under-sampled images. Under-sampling is a key feature of visual disorders associated with neuro-retinal matrix damage. It is conceivable that a biological equivalent of super-resolution might be recruited in these settings. The need for sets of similar images might be satisfied by augmenting retinal image movements.

Methods: Monocular letter acuity thresholds were measured by computer graphics in normal subjects, with and without controlled test target movements. Various degrees of neuro-retinal matrix defects were simulated by superposing stationary masks on the test targets.

Results: Static acuity thresholds increased monotonically with increased mask densities. The addition of target movement partially counteracted the threshold increment. The effect was barely measurable at small mask densities and increased monotonically to a gain of approximately 2 lines on a decimal acuity scale with masks simulating loss of 90% of neural matrix elements. Similar results were obtained from a patient with an acquired neuro-retinal matrix defect, attesting to the validity of the mask experiments.

Conclusion: Super-normal retinal image movements have subtle effects on visual resolution in normal eyes whereas eyes with neuro-retinal matrix defects may improve markedly. This finding may have implications for the development of aids for the visually handicapped.

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