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Structure-Function Relationship in Keratoconus: Spatial and Depth Vision.

Preetam Kumar1,2,3, Peter Campbell1, Pravin K Vaddavalli4

  • 1Department of Optometry and Visual Science, School of Health and Psychological Sciences, City, University of London, Northampton Square, London, United Kingdom.

Translational Vision Science & Technology
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Summary
This summary is machine-generated.

Vision loss in keratoconus impacts spatial and depth perception differently. Contrast sensitivity declines earlier than visual acuity, while depth perception deteriorates significantly even in early disease stages.

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Corneal Diseases

Background:

  • Keratoconus is a progressive corneal disease affecting vision.
  • Understanding vision changes is crucial for managing keratoconus.

Purpose of the Study:

  • To analyze spatial and depth vision changes with keratoconus progression.
  • To model the structure-function relationship and identify visual function loss phases.

Main Methods:

  • Assessed visual acuity, contrast sensitivity function (CSF), and stereoacuity in 155 keratoconus patients.
  • Quantified disease severity using the multimetric D-index.
  • Employed logistic nonlinear regression to model structure-function relationships.

Main Results:

  • Logistic regression best explained spatial vision variance (R2 ≥ 66%).
  • Visual acuity showed a ceiling effect and steeper loss rate; CSF area had a shallower loss rate.
  • Stereoacuity loss was poorly modeled; depth perception significantly deteriorated early in the disease.

Conclusions:

  • Vision loss patterns vary by visual function in keratoconus.
  • Contrast sensitivity may precede visual acuity loss.
  • Depth perception is compromised early in keratoconus.