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The Iowa Head-Mounted Display (HMD) Open-Source Perimeter shows valid visual field (VF) results, matching the repeatability of the Octopus 900. This offers a portable and affordable alternative for perimetry testing.

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Area of Science:

  • Ophthalmology
  • Medical Devices
  • Visual Science

Background:

  • Traditional perimetry methods can be expensive and lack portability.
  • Assessing visual field (VF) defects is crucial for diagnosing and monitoring eye conditions like glaucoma.
  • The development of novel, accessible perimetry technologies is essential for expanding patient access to eye care.

Purpose of the Study:

  • To validate visual field (VF) results obtained from the Iowa Head-Mounted Display (HMD) Open-Source Perimeter.
  • To compare the test-retest repeatability and VF defect detection capabilities of the HMD perimeter against the Octopus 900 perimeter.

Main Methods:

  • Twenty healthy participants and nine glaucoma patients underwent visual field testing using both the HMD and Octopus 900 perimeters.
  • The Open Perimetry Interface platform, size V stimuli, a custom central 26° grid, and ZEST thresholding were employed.
  • Historical data from the Humphrey Field Analyzer (HFA) were analyzed for comparison; repeatability was assessed using the repeatability coefficient (RC).

Main Results:

  • Pointwise RCs for the HMD and Octopus 900 were 2.6 dB and 3.4 dB (healthy), and 4.2 dB and 3.5 dB (glaucoma), respectively.
  • Limits of agreement between HMD and Octopus 900 were ±4.6 dB (healthy) and ±8.9 dB (glaucoma).
  • VF defect detection was similar between the HMD and Octopus 900 for glaucoma patients.

Conclusions:

  • The Iowa HMD Open-Source Perimeter demonstrates comparable repeatability to the Octopus 900.
  • The HMD offers a more portable and cost-effective alternative to traditional perimetry devices.
  • The study validates the HMD's visual field results, potentially increasing access to perimetry testing.