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A topographical method to quantify scleral contact lens decentration.

Stephen J Vincent1, Michael J Collins1

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Quantify scleral lens decentration using over-topography. A standard power scale offers repeatable measurements for clinical and research applications.

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Lens decentrationScleral contact lensTopography

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Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Engineering

Background:

  • Scleral contact lenses are used to correct complex vision problems.
  • Accurate measurement of lens position (decentration) is crucial for optimal vision and comfort.
  • Existing methods for quantifying decentration can be complex or require specialized equipment.

Purpose of the Study:

  • To present a straightforward method for quantifying scleral contact lens decentration.
  • To assess the repeatability of this method using over-topography data.
  • To evaluate the utility of standard versus normalized dioptric scales for this measurement.

Main Methods:

  • Over-topography was performed on 10 healthy participants wearing scleral lenses.
  • Horizontal and vertical decentration were calculated from tangential power maps.
  • Measurements were analyzed using both standard and normalized dioptric scales.
  • Intrasession, intraobserver, and inter-technique repeatability were assessed.

Main Results:

  • Mean scleral lens decentration was 0.62 mm temporally and 0.91 mm inferiorly.
  • Measurements using a standard power scale showed higher repeatability.
  • Intraobserver repeatability with a standard scale was ±0.07 mm; intrasession repeatability was ±0.15 mm.
  • Normalized scale measurements were less repeatable.

Conclusions:

  • Scleral lens decentration can be reliably quantified using standard scale tangential power maps from over-topography.
  • This simple method requires no specialized instrumentation or software.
  • The technique is suitable for both clinical practice and research settings.